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201-656: The Gorlice–Tarnów offensive during World War I was initially conceived as a minor German offensive to relieve Russian pressure on the Austro-Hungarians to their south on the Eastern Front , but resulted in the Central Powers ' chief offensive effort of 1915, causing the total collapse of the Russian lines and their retreat far into Russia. The continued series of actions lasted the majority of

402-523: A Bosnian Serb named Gavrilo Princip assassinated Archduke Franz Ferdinand , heir to the Austro-Hungarian throne. Austria-Hungary held Serbia responsible, and declared war on 28 July. After Russia mobilised in Serbia's defence, Germany declared war on Russia and France , who had an alliance . The United Kingdom entered after Germany invaded Belgium , whose neutrality it guaranteed, and

603-645: A blue-water navy was vital for global power projection; Tirpitz had his books translated into German, while Wilhelm made them required reading for his advisors and senior military personnel. However, it was also an emotional decision, driven by Wilhelm's simultaneous admiration for the Royal Navy and desire to surpass it. Bismarck thought that the British would not interfere in Europe, as long as its maritime supremacy remained secure, but his dismissal in 1890 led to

804-592: A grenade at the Archduke's car and injured two of his aides. The other assassins were also unsuccessful. An hour later, as Ferdinand was returning from visiting the injured officers in hospital, his car took a wrong turn into a street where Gavrilo Princip was standing. He fired two pistol shots, fatally wounding Ferdinand and his wife Sophie . According to historian Zbyněk Zeman , in Vienna "the event almost failed to make any impression whatsoever. On 28 and 29 June,

1005-540: A guerrilla warfare campaign and only surrendered two weeks after the armistice took effect in Europe. Before the war, Germany had attempted to use Indian nationalism and pan-Islamism to its advantage, a policy continued post-1914 by instigating uprisings in India , while the Niedermayer–Hentig Expedition urged Afghanistan to join the war on the side of Central Powers. However, contrary to British fears of

1206-420: A 2 mi (3.2 km) front. Preceded by a hurricane bombardment lasting only 35 minutes, the village was captured within four hours. The advance then slowed because of supply and communication difficulties. The Germans brought up reserves and counterattacked , forestalling the attempt to capture the ridge. Since the British had used about a third of their artillery ammunition , General Sir John French blamed

1407-476: A breakthrough from a counter-offensive. He also kept tight control of the main reserve, feeding in just enough troops to keep the battle going. In preparation for their attack, the Germans had amassed a concentration of aircraft near the fortress. In the opening phase, they swept the air space of French aircraft, which allowed German artillery-observation aircraft and bombers to operate without interference. In May,

1608-492: A breakthrough might no longer be possible and instead focused on forcing a French defeat by inflicting massive casualties. His new goal was to "bleed France white." As such, he adopted two new strategies. The first was the use of unrestricted submarine warfare to cut off entente supplies arriving from overseas. The second would be attacks against the French army intended to inflict maximum casualties; Falkenhayn planned to attack

1809-590: A brief engagement first on 7 August, and then again on 23 August, but German reserve forces engaged them in the Battle of Mulhouse and forced the French to retreat twice. The German Army swept through Belgium, executing civilians and razing villages. The application of "collective responsibility" against a civilian population further galvanised the entente. Newspapers condemned the German invasion, violence against civilians and destruction of property, which became known as

2010-404: A change in French command at Verdun from the defensive-minded Philippe Pétain to the offensive-minded Robert Nivelle , the French attempted to re-capture Fort Douaumont on 22 May but were easily repulsed. The Germans captured Fort Vaux on 7 June and with the aid of diphosgene gas, came within 1 kilometre (1,100 yd) of the last ridge before Verdun before being contained on 23 June. Over

2211-408: A change in policy and an Anglo-German naval arms race began. Despite the vast sums spent by Tirpitz, the launch of HMS  Dreadnought in 1906 gave the British a technological advantage. Ultimately, the race diverted huge resources into creating a German navy large enough to antagonise Britain, but not defeat it; in 1911, Chancellor Theobald von Bethmann Hollweg acknowledged defeat, leading to

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2412-632: A counter-move. On 1 May, the Central Powers' artillery opened harassing fire, zeroing in their guns. The following morning at 0600 they began a sustained bombardment from field guns to heavy howitzers, at 0900 the mortars joined in. The huge mortar shells were especially terrifying, their blast killed men tens of meters from the explosion. The Russian fortifications were "... more ditches than trenches." According to François, "The mortars began their destructive work. The ground trembled, hell seemed to be let loose." According to Arz, "Our tension peaked as

2613-613: A direct threat. The 1908–1909 Bosnian Crisis began when Austria annexed the former Ottoman territory of Bosnia and Herzegovina , which it had occupied since 1878. Timed to coincide with the Bulgarian Declaration of Independence from the Ottoman Empire, this unilateral action was denounced by the European powers, but accepted as there was no consensus on how to resolve the situation. Some historians see this as

2814-640: A dramatic effect on the conflict as 33 divisions were released from the Eastern Front for deployment to the west. The Germans occupied almost as much Russian territory under the provisions of the Treaty of Brest-Litovsk as they did in the Second World War but this considerably restricted their troop redeployment. The Germans achieved an advantage of 192 divisions in the west to the 178 entente divisions, which allowed Germany to pull veteran units from

3015-471: A fighter training school was opened at Valenciennes and better aircraft with twin guns were introduced. The result was higher losses of Allied aircraft, particularly for the British, Portuguese, Belgians and Australians who were struggling with outmoded aircraft, poor training and tactics. The Allied air successes over the Somme were not repeated. During their attack at Arras, the British lost 316 air crews and

3216-418: A gap between the German armies as they closed on Paris. The French army, reinforced by the British expeditionary corps, seized this opportunity to counter-attack and pushed the German army 40 to 80 km back. Both armies were then so exhausted that no decisive move could be implemented, so they settled in trenches, with the vain hope of breaking through as soon as they could build local superiority. In 1911,

3417-399: A general offensive along the entire front, and secondly, from the Russian side they received the character of a targeted defense, and not attempts to turn the tide of the struggle and seize the offensive initiative, thirdly, they demanded that the enemy conduct separate preparations for the operation, including the redeployment of two armies. The reasons for the defeat of the Russian armies in

3618-452: A high price. The arriving reserves (6.5 divisions) brought into action during the offensive were fully utilized by the beginning of July. Although the Russian troops at certain moments of the battles lacked artillery shells (while the consumption of shells was the highest since the beginning of the war), they were well equipped with rifle cartridges and retained an advantage in the number of machine guns. Skillfully directed fire from hand weapons

3819-645: A long period of success before Britain resorted to the convoy system, bringing a large reduction in shipping losses. By 1917, the size of the British Army on the Western Front had grown to two-thirds of the size of the French force. In April 1917 the BEF began the Battle of Arras . The Canadian Corps and the 5th Division of the First Army, fought the Battle of Vimy Ridge , completing the capture of

4020-411: A machine-gun that shot forward through the propeller blades. This was achieved by crudely reinforcing the blades to deflect bullets. Several weeks later Garros force-landed behind German lines. His aeroplane was captured and sent to Dutch engineer Anthony Fokker , who soon produced a significant improvement, the interrupter gear , in which the machine gun is synchronised with the propeller so it fires in

4221-423: A major push. The final phase of the battle of the Somme saw the first use of the tank on the battlefield. The entente prepared an attack that would involve 13 British and Imperial divisions and four French corps. The attack made early progress, advancing 3,200–4,100 metres (3,500–4,500 yd) in places but the tanks had little effect due to their lack of numbers and mechanical unreliability. The final phase of

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4422-592: A new Eleventh Army made up of eight divisions, trained in assault tactics in the west. They were brought east on 500 trains. The Eleventh Army was led by the former commander of the German Ninth Army, General August von Mackensen , with Colonel Hans von Seeckt as chief of staff. They would be opposed by the Russian Third Army with eighteen and a half infantry and five and a half cavalry divisions, under General D. R. Radko-Dmitriev . Mackensen

4623-407: A new system of defence. Rather than relying on a heavily fortified front line, the defence was to be arranged in a series of echelons. The front line would be a thinly manned series of outposts, reinforced by a series of strongpoints and a sheltered reserve. If a slope was available, troops were deployed along the rear side for protection. The defence became fully integrated with command of artillery at

4824-441: A position from which the French could not retreat, for reasons of strategy and national pride and thus trap the French. The town of Verdun was chosen for this because it was an important stronghold, surrounded by a ring of forts, that lay near the German lines and because it guarded the direct route to Paris. Falkenhayn limited the size of the front to 5–6 kilometres (3–4 mi) to concentrate artillery firepower and to prevent

5025-548: A possibility. This was accentuated by British and Russian support for France against Germany during the 1911 Agadir Crisis . German economic and industrial strength continued to expand rapidly post-1871. Backed by Wilhelm II, Admiral Alfred von Tirpitz sought to use this growth to build an Imperial German Navy , that could compete with the British Royal Navy . This policy was based on the work of US naval author Alfred Thayer Mahan , who argued that possession of

5226-773: A revolt in India, the outbreak of the war saw a reduction in nationalist activity. Leaders from the Indian National Congress and other groups believed support for the British war effort would hasten Indian Home Rule , a promise allegedly made explicit in 1917 by Edwin Montagu , the Secretary of State for India . In 1914, the British Indian Army was larger than the British Army itself, and between 1914 and 1918 an estimated 1.3 million Indian soldiers and labourers served in Europe, Africa, and

5427-478: A separate peace if the Germans would not help. According to Prit Buttar , "...it did seem as if the Russian Army had been gravely weakened by the recent campaigns...both AOK and OHL knew about Russian losses and difficulties with ammunition supply. Therefore, merely reducing the pressure on the k.u.k. Army would not be sufficient; Falkenhayn wished to strike a blow that would permanently diminish

5628-516: A significant escalation, ending any chance of Austria cooperating with Russia in the Balkans, while also damaging diplomatic relations between Serbia and Italy. Tensions increased after the 1911–1912 Italo-Turkish War demonstrated Ottoman weakness and led to the formation of the Balkan League , an alliance of Serbia, Bulgaria, Montenegro , and Greece . The League quickly overran most of

5829-441: A single day in the history of the British Army, about 57,000. The Verdun lesson learnt, the entente tactical aim became the achievement of air superiority and until September, German aircraft were swept from the skies over the Somme. The success of the entente air offensive caused a reorganisation of the German air arm and both sides began using large formations of aircraft rather than relying on individual combat. After regrouping,

6030-507: A six-day bombardment and advanced 5 kilometres (3 mi) to capture Vimy Ridge. German reinforcements counter-attacked and pushed the French back towards their starting points because French reserves had been held back and the success of the attack had come as a surprise. By 15 May the advance had been stopped, although the fighting continued until 18 June. In May the German Army captured a French document at La Ville-aux-Bois describing

6231-586: A very high degree of defense. According to two prominent historians: Between the coast and the Vosges was a westward bulge in the trench line, named the Noyon salient after the French town at the maximum point of the German advance near Compiègne . Joffre's plan for 1915 was to attack the salient on both flanks to cut it off. The Fourth Army had attacked in Champagne from 20 December 1914 – 17 March 1915 but

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6432-478: A war on two fronts; the Schlieffen Plan envisaged using 80% of the army to defeat France, then switching to Russia. Since this required them to move quickly, mobilization orders were issued that afternoon. Once the German ultimatum to Russia expired on the morning of 1 August, the two countries were at war. At a meeting on 29 July, the British cabinet had narrowly decided its obligations to Belgium under

6633-402: A weak Ottoman government, rather than an ambitious Slav power like Bulgaria . Russia had ambitions in northeastern Anatolia while its clients had overlapping claims in the Balkans. These competing interests divided Russian policy-makers and added to regional instability. Austrian statesmen viewed the Balkans as essential for the continued existence of their Empire and saw Serbian expansion as

6834-500: A week-long artillery bombardment and accompanied by tanks. The offensive proceeded poorly as the French troops, with the help of two Russian brigades , had to negotiate rough, upward-sloping terrain in extremely bad weather. Planning had been dislocated by the voluntary German withdrawal to the Hindenburg Line. Secrecy had been compromised and German aircraft gained air superiority, making reconnaissance difficult and in places,

7035-403: A whole, the Somme offensive led to an estimated 420,000 British casualties, along with 200,000 French and 500,000 Germans. The diseases that emerged in the trenches were a major killer on both sides. The living conditions led to disease and infection, such as trench foot , lice , typhus , trench fever , and the ' Spanish flu '. At the start of the war, German cruisers were scattered across

7236-508: Is known, however, that from 1908 to 1913, military spending by the six major European powers increased by over 50% in real terms. The years before 1914 were marked by a series of crises in the Balkans, as other powers sought to benefit from the Ottoman decline. While Pan-Slavic and Orthodox Russia considered itself the protector of Serbia and other Slav states, they preferred the strategically vital Bosporus straits to be controlled by

7437-574: The Schutzkorps was established, and carried out the persecution of Serbs. The assassination initiated the July Crisis, a month of diplomatic manoeuvring between Austria-Hungary, Germany, Russia, France and Britain. Believing that Serbian intelligence helped organise Franz Ferdinand's murder, Austrian officials wanted to use the opportunity to end their interference in Bosnia and saw war as

7638-641: The World War . In August 1914, the magazine The Independent wrote "This is the Great War. It names itself". In October 1914, the Canadian magazine Maclean's similarly wrote, "Some wars name themselves. This is the Great War." Contemporary Europeans also referred to it as " the war to end war " and it was also described as "the war to end all wars" due to their perception of its unparalleled scale, devastation, and loss of life. The first recorded use of

7839-643: The Australian Naval and Military Expeditionary Force landed on the island of New Britain , then part of German New Guinea . On 28 October, the German cruiser SMS  Emden sank the Russian cruiser Zhemchug in the Battle of Penang . Japan declared war on Germany before seizing territories in the Pacific, which later became the South Seas Mandate , as well as German Treaty ports on

8040-612: The Battle of Mons . In the former battle the French Fifth Army was almost destroyed by the German 2nd and 3rd Armies and the latter delayed the German advance by a day. A general entente retreat followed, resulting in more clashes at the Battle of Le Cateau , the Siege of Maubeuge and the Battle of St. Quentin (also called the First Battle of Guise). The German Army came within 70 km (43 mi) of Paris but at

8241-546: The Beskidenkorps , on his southern flank. The Eleventh Army Order of battle , north to south, consisted of Karl von Behr's Corps, Emmich's X Corps, Eugen von Falkenhayn 's XXII Reserve Corps, Plettenberg's Guards Corps, Arz's Austro-Hungarian VI Corps, and François' XLI Reserve Corps. The attack commenced on 13 June, and by 17 June, the Germans had pushed the front line back 18 miles (29 km) to positions near Gródek. The German attack commenced again on 19 June, after

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8442-625: The Dukla Pass began its withdrawal, as did the XXIV Corps near Nowy Żmigród, signifying Russian control of the Carpathians was becoming ever more tenuous. The Korps Emmich 20th Infantry Division, Korps Kneussl was renamed after Otto von Emmich took over command, captured Nowy Żmigród . Using an intact bridge over the Wisłoka, this division was able to advance to Wietrzno . By 5 May

8643-577: The First Battle of the Marne (6–12 September), French and British troops were able to force a German retreat by exploiting a gap which appeared between the 1st and 2nd Armies, ending the German advance into France. The German Army retreated north of the Aisne and dug in there, establishing the beginnings of a static western front that was to last for the next three years. Following this German retirement,

8844-598: The French Army and trap it on the German border. Belgian neutrality had been guaranteed by Britain under the Treaty of London, 1839 ; this caused Britain to join the war at the expiration of its ultimatum at midnight on 4 August. Armies under German generals Alexander von Kluck and Karl von Bülow attacked Belgium on 4 August 1914. Luxembourg had been occupied without opposition on 2 August. The first battle in Belgium

9045-559: The II ANZAC Corps and took the village of Passchendaele on 6 November, despite rain, mud and many casualties. The offensive was costly in manpower for both sides for relatively little gain of ground against determined German resistance but the ground captured was of great tactical importance. In the drier periods, the British advance was inexorable and during the unusually wet August and in the Autumn rains that began in early October,

9246-547: The Ieperlee from Nieuwpoort to Boezinge . Meanwhile, the British Expeditionary Force (BEF) occupied a position on the flank, having occupied a more central position. From 19 October until 22 November, the German forces made their final breakthrough attempt of 1914 during the First Battle of Ypres , which ended in a mutually-costly stalemate. After the battle, Erich von Falkenhayn judged that it

9447-631: The Middle East , as well as in parts of Africa and the Asia-Pacific , and in Europe was characterised by trench warfare ; the widespread use of artillery , machine guns, and chemical weapons (gas); and the introductions of tanks and aircraft . World War I was one of the deadliest conflicts in history , resulting in an estimated 10 million military dead and more than 20 million wounded , plus some 10 million civilian dead from causes including genocide . The movement of large numbers of people

9648-721: The Rüstungswende or 'armaments turning point', when he switched expenditure from the navy to the army. This decision was not driven by a reduction in political tensions but by German concern over Russia's quick recovery from its defeat in the Russo-Japanese War and subsequent 1905 Russian Revolution . Economic reforms led to a significant post-1908 expansion of railways and transportation infrastructure, particularly in its western border regions. Since Germany and Austria-Hungary relied on faster mobilisation to compensate for their numerical inferiority compared to Russia,

9849-574: The Tanew River , while Brusilov's Eighth Army retreated towards Lemberg near Gródek . Furthermore, Brusilov was ordered to relinquish his V Caucasian and XXII Corps, so that the Third Army could form a southern flank in combination with their II Cauciasian and XXIX Corps. This Third Army southern flank, led by Vladimir Olukhov, was supposed to prevent the 'Mackensen phalanx' from gaining any additional territory. The Central Powers' next objective

10050-581: The Treaty of Versailles in 1919. The Western Front was the place where the most powerful military forces in Europe, the German and French armies, met and where the First World War was decided. At the outbreak of the war, the German Army, with seven field armies in the west and one in the east, executed a modified version of the Schlieffen Plan , bypassing French defenses along the common border by moving quickly through neutral Belgium, and then turning southwards to attack France and attempt to encircle

10251-764: The United States entered the war on the Allied side following Germany's resumption of unrestricted submarine warfare against Atlantic shipping. Later that year, the Bolsheviks seized power in the Russian October Revolution , and Soviet Russia signed an armistice with the Central Powers in December, followed by a separate peace in March 1918. That month, Germany launched an offensive in

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10452-712: The War Office claimed, with some justification, that this withdrawal resulted from the casualties the Germans received during the Battles of the Somme and Verdun, despite the entente suffering greater losses. On 6 April the United States declared war on Germany. In early 1915, following the sinking of the Lusitania , Germany had stopped unrestricted submarine warfare in the Atlantic because of concerns of drawing

10653-487: The hydrophone and depth charges were introduced, destroyers could potentially successfully attack a submerged submarine. Convoys slowed the flow of supplies since ships had to wait as convoys were assembled; the solution was an extensive program of building new freighters. Troopships were too fast for the submarines and did not travel the North Atlantic in convoys. The U-boats sunk more than 5,000 Allied ships, at

10854-654: The tank . After the First Battle of the Marne in September 1914, Allied and German forces unsuccessfully tried to outflank each other, a series of manoeuvres later known as the " Race to the Sea ". By the end of 1914, the opposing forces confronted each other along an uninterrupted line of entrenched positions from the Channel to the Swiss border. Since the Germans were normally able to choose where to stand, they generally held

11055-668: The " Rape of Belgium ." After marching through Belgium, Luxembourg and the Ardennes , the Germans advanced into northern France in late August, where they met the French Army, under Joseph Joffre , and the divisions of the British Expeditionary Force under Field Marshal Sir John French . A series of engagements known as the Battle of the Frontiers ensued, which included the Battle of Charleroi and

11256-407: The 13-foot-wide (4 m) German tank traps. Special "grapnel tanks" towed hooks to pull away the German barbed wire. The attack was a great success for the British, who penetrated further in six hours than at the Third Ypres in four months, at a cost of only 4,000 British casualties. The advance produced an awkward salient and a surprise German counter-offensive began on 30 November, which drove back

11457-588: The 1839 Treaty of London did not require it to oppose a German invasion with military force; however, Prime Minister Asquith and his senior Cabinet ministers were already committed to supporting France, the Royal Navy had been mobilised, and public opinion was strongly in favour of intervention. On 31 July, Britain sent notes to Germany and France, asking them to respect Belgian neutrality; France pledged to do so, but Germany did not reply. Aware of German plans to attack through Belgium, French Commander-in-Chief Joseph Joffre asked his government for permission to cross

11658-431: The 1879 Dual Alliance , which became the Triple Alliance when Italy joined in 1882. For Bismarck, the purpose of these agreements was to isolate France by ensuring the three Empires resolve any disputes between themselves. In 1887, Bismarck set up the Reinsurance Treaty , a secret agreement between Germany and Russia to remain neutral if either were attacked by France or Austria-Hungary. For Bismarck, peace with Russia

11859-441: The 1913 Treaty of London , which had created an independent Albania while enlarging the territories of Bulgaria, Serbia, Montenegro and Greece. However, disputes between the victors sparked the 33-day Second Balkan War , when Bulgaria attacked Serbia and Greece on 16 June 1913; it was defeated, losing most of Macedonia to Serbia and Greece, and Southern Dobruja to Romania. The result was that even countries which benefited from

12060-429: The 1915 campaign, which became the most important operation, were usually called the overwhelming numerical superiority of the Central Powers, insufficient technical equipment and lack of artillery ammunition, and the excessive persistence of the Russia Headquarters in defending the conquered Galicia. One of the first researchers of the First World War in Russia, Andrei Zayonchkovski , saw the causes of defeats primarily in

12261-451: The 42 km (26 mi) length of the breakthrough sector. Facing him were five Russian divisions consisting of 60,000 men but desperately short on artillery. For fire support, the Russians could only count on 141 light artillery pieces and four heavy guns. One of the four burst as soon as the battle began. The Russian supreme commander, the Grand Duke Nicholas Nicholaevitch , learned that Germans had arrived on their flank but did not make

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12462-409: The Austrians and Serbs clashed at the battles of the Cer and Kolubara ; over the next two weeks, Austrian attacks were repulsed with heavy losses. As a result, Austria had to keep sizeable forces on the Serbian front, weakening their efforts against Russia. Serbia's victory against Austria-Hungary in the 1914 invasion has been called one of the major upset victories of the twentieth century. In 1915,

12663-593: The Austrians briefly occupied the Serbian capital, Belgrade . A Serbian counter-attack in the Battle of Kolubara succeeded in driving them from the country by the end of 1914. For the first 10 months of 1915, Austria-Hungary used most of its military reserves to fight Italy. German and Austro-Hungarian diplomats scored a coup by persuading Bulgaria to join the attack on Serbia. The Austro-Hungarian provinces of Slovenia , Croatia and Bosnia provided troops for Austria-Hungary. Montenegro allied itself with Serbia. Bulgaria declared war on Serbia on 14 October 1915 and joined in

12864-493: The Balkan Wars, such as Serbia and Greece, felt cheated of their "rightful gains", while for Austria it demonstrated the apparent indifference with which other powers viewed their concerns, including Germany. This complex mix of resentment, nationalism and insecurity helps explain why the pre-1914 Balkans became known as the " powder keg of Europe ". On 28 June 1914, Archduke Franz Ferdinand of Austria , heir presumptive to Emperor Franz Joseph I of Austria , visited Sarajevo ,

13065-455: The Battle of the Somme with the Battle of Albert , supported by five French divisions on their right flank. The attack had been preceded by seven days of heavy artillery bombardment. The experienced French forces were successful in advancing but the British artillery cover had neither blasted away barbed wire, nor destroyed German trenches as effectively as was planned. They suffered the greatest number of casualties (killed, wounded and missing) in

13266-519: The British in the south and failed in the north. Despite the reversal, the attack was seen as a success by the entente, proving that tanks could overcome trench defences. The Germans realised that the use of tanks by the entente posed a new threat to any defensive strategy they might mount. The battle had also seen the first mass use of German Stosstruppen on the Western front in the attack, who used infantry infiltration tactics to penetrate British defences, bypassing resistance and quickly advancing into

13467-506: The British launched an offensive in Flanders, in part to take the pressure off the French armies on the Aisne, after the French part of the Nivelle Offensive failed to achieve the strategic victory that had been planned and French troops began to mutiny . The offensive began on 7 June, with a British attack on Messines Ridge , south of Ypres, to retake the ground lost in the First and Second battles in 1914. Since 1915 specialist Royal Engineer tunnelling companies had been digging tunnels under

13668-419: The British rear. Following the successful entente attack and penetration of the German defences at Cambrai, Ludendorff and Hindenburg determined that the only opportunity for German victory lay in a decisive attack along the Western front during the spring, before American manpower became overwhelming. On 3 March 1918, the Treaty of Brest-Litovsk was signed and Russia withdrew from the war. This would now have

13869-458: The Canadians lost 114 compared to 44 lost by the Germans. This became known to the Royal Flying Corps as Bloody April . The same month, the French Commander-in-chief , General Robert Nivelle, ordered a new offensive against the German trenches, promising that it would end the war within 48 hours. The 16 April attack, dubbed the Nivelle Offensive (also known as the Second Battle of the Aisne ), would be 1.2 million men strong, preceded by

14070-412: The Central Powers. Based on these data, it can be assumed that 170,628 men died on the part of the Russian troops in the operation, and 140,420 men died on the part of the Central Powers. After the retreat of the Russian troops from Galicia, only within the military districts of Kraków , Lvov (Lemberg) and Przemyśl , 566,833 soldiers of the Russian, German and Austro-Hungarian armies who had died since

14271-404: The Central Powers. However, the pro-German King Constantine I dismissed the pro-Allied government of Eleftherios Venizelos before the Allied expeditionary force arrived. The Macedonian front was at first mostly static. French and Serbian forces retook limited areas of Macedonia by recapturing Bitola on 19 November 1916 following the costly Monastir offensive , which brought stabilisation of

14472-649: The Chinese Shandong peninsula at Tsingtao . After Vienna refused to withdraw its cruiser SMS  Kaiserin Elisabeth from Tsingtao, Japan declared war on Austria-Hungary, and the ship was sunk in November 1914. Within a few months, Allied forces had seized all German territories in the Pacific, leaving only isolated commerce raiders and a few holdouts in New Guinea. Some of the first clashes of

14673-685: The Eleventh Army should advance north towards Brest-Litovsk, with their flanks shielded by the rivers Vistula and Bug. Mackensen and Falkenhayn supported this strategy of attacking the Russian salient in Poland, and forcing a decisive battle. Ober Ost , led by Paul von Hindenburg and Erich Ludendorff , would attack towards the southeast, while Mackensen turned north, and the Austro-Hungarian Second Army attacked east. The Grand Duke Nicholas issued orders that yielded to

14874-457: The French countered by deploying escadrilles de chasse with superior Nieuport fighters and the air over Verdun turned into a battlefield as both sides fought for air superiority . The Battle of Verdun began on 21 February 1916 after a nine-day delay due to snow and blizzards. After a massive eight-hour artillery bombardment, the Germans did not expect much resistance as they slowly advanced on Verdun and its forts. Sporadic French resistance

15075-400: The French trenches. The green-yellow cloud started killing some defenders and those in the rear fled in panic , creating an undefended 3.7-mile (6 km) gap in the entente line. The Germans were unprepared for the level of their success and lacked sufficient reserves to exploit the opening. Canadian troops on the right drew back their left flank and halted the German advance. The gas attack

15276-578: The French were not able to attack in Artois at the same time. The Tenth Army formed the northern attack force and was to attack eastwards into the Douai plain on a 16 km (9.9 mi) front between Loos and Arras. On 10 March, as part of the larger offensive in the Artois region, the British Army fought the Battle of Neuve Chapelle to capture Aubers Ridge. The assault was made by four divisions on

15477-623: The German High Seas Fleet was confined to port. German U-boats attempted to cut the supply lines between North America and Britain. The nature of submarine warfare meant that attacks often came without warning, giving the crews of the merchant ships little hope of survival. The United States launched a protest, and Germany changed its rules of engagement. After the sinking of the passenger ship RMS Lusitania in 1915, Germany promised not to target passenger liners, while Britain armed its merchant ships, placing them beyond

15678-525: The German Army increased in size from 1908 to 1914, he changed the allocation of forces between the two wings to 70:30. He also considered Dutch neutrality essential for German trade and cancelled the incursion into the Netherlands, which meant any delays in Belgium threatened the viability of the plan. Historian Richard Holmes argues that these changes meant the right wing was not strong enough to achieve decisive success. The initial German advance in

15879-763: The German Supreme Commander of All German Forces in the East ( Ober Ost ) announced the capture in May – early July 1915 in Galicia, Bukovina and the Kingdom of Poland 3 generals, 1,354 officers and 445,622 soldiers of the Russian army, 350 guns, 983 machine guns. The Russian side officially announced the capture in May–June 1915 of 100,476 prisoners (of which 1,366 officers), 68 guns, 3 mortars and 218 machine guns of

16080-570: The German advance. Radko Dimitriev quickly sent two divisions to stem the Austro-German breakthrough, but they were utterly annihilated before they could even report back to headquarters. From the Russian point of view, both divisions simply disappeared from the map. On 3 May the Grand Duke Nicholas was sufficiently concerned to provide three additional divisions and to authorize a limited withdrawal. The Russian XII Corps near

16281-741: The German alliance), the final lines were occupied with the armies of each nation defending a part of the front. From the coast in the north, the primary forces were from Belgium, the British Empire and then France. Following the Battle of the Yser in October, the Belgian army controlled a 35 km (22 mi) length of West Flanders along the coast, known as the Yser Front , along the Yser and

16482-560: The German breakthrough. Soon after, Dimitriev was dismissed, replaced by Leonid Lesh . On 28 May, the German XLI Corps 81st Infantry Division captured Stubno and Nakło north of the Przemyśl Fortress . On 31 May, the Germans started capturing the forts surrounding the fortress, and Brusilov ordered its abandonment. Kneussl's 11th Bavarian Infantry Division marched in unopposed on 3 June. Lesh's Third Army then retreated to

16683-404: The German front line. On 25 February the German armies west of the line began Operation Alberich a withdrawal to the line and completed the retirement on 5 April, leaving a supply desert of scorched earth to be occupied by the entente. This withdrawal negated the French strategy of attacking both flanks of the Noyon salient, as it no longer existed. The British continued offensive operations as

16884-573: The German navy, were soon back in production and 480,000 tons of badly-needed oil was captured. The battles on the Bug and Zlota Lipa Rivers ended the Gorlice–Tarnów offensive, during which the armies of the Central Powers managed to inflict the largest defeat on the troops of the Russian Empire. The operation, which lasted 70 days, in terms of the number of troops involved (taking into account

17085-648: The German right wing would sweep through the Netherlands and Belgium , then swing south, encircling Paris and trapping the French army against the Swiss border. The plan's creator, Alfred von Schlieffen , head of the German General Staff from 1891 to 1906, estimated that this would take six weeks, after which the German army would transfer to the East and defeat the Russians. The plan was substantially modified by his successor, Helmuth von Moltke

17286-404: The Germans achieved only costly defensive successes, which led the German commanders in early October to begin preparations for a general retreat. Both sides lost a combined total of over a half million men during this offensive. The battle has become a byword among some British revisionist historians for bloody and futile slaughter, whilst the Germans called Passchendaele "the greatest martyrdom of

17487-537: The Germans adopted a new defence-in-depth scheme that consisted of a series of defensive zones and positions with a depth of up to 8.0 km (5 mi). On 25 September, the British began the Battle of Loos , part of the Third Battle of Artois, which was meant to supplement the larger Champagne attack. The attack was preceded by a four-day artillery bombardment of 250,000 shells and a release of 5,100 cylinders of chlorine gas. The attack involved two corps in

17688-426: The Germans bled heavily as well, with anywhere from 700,000 to 975,000 casualties between the two combatants. Verdun became a symbol of French determination and self-sacrifice. The Battle of the Somme was an Anglo-French offensive from July to November 1916. The opening day on 1 July 1916 was the bloodiest single day in the history of the British Army , which suffered 57,500 casualties, including 19,200 dead. As

17889-462: The Germans on 20 August. Although the German army bypassed Antwerp, it remained a threat to their flank. Another siege followed at Namur, lasting from about 20–23 August. The French deployed five armies on the frontier. The French Plan XVII was intended to bring about the capture of Alsace–Lorraine . On 7 August, the VII Corps attacked Alsace to capture Mulhouse and Colmar. The main offensive

18090-471: The Lodz offensive in Poland (11–25 November), Falkenhayn hoped that the Russians would be made amenable to peace overtures. In his discussions with Bethmann Hollweg, Falkenhayn viewed Germany and Russia as having no insoluble conflict and that the real enemies of Germany were France and Britain. A peace with only a few annexations of territory also seemed possible with France and that with Russia and France out of

18291-625: The Middle East. In all, 140,000 soldiers served on the Western Front and nearly 700,000 in the Middle East, with 47,746 killed and 65,126 wounded. The suffering engendered by the war, as well as the failure of the British government to grant self-government to India afterward, bred disillusionment, resulting in the campaign for full independence led by Mahatma Gandhi . Pre-war military tactics that had emphasised open warfare and individual riflemen proved obsolete when confronted with conditions prevailing in 1914. Technological advances allowed

18492-728: The Ottomans joined the Central Powers in November. Germany's strategy in 1914 was to quickly defeat France, then to transfer its forces to the east, but its advance was halted in September , and by the end of the year the Western Front consisted of a continuous line of trenches stretching from the English Channel to Switzerland. The Eastern Front was more dynamic, but neither side gained a decisive advantage, despite costly offensives. Italy , Bulgaria , Romania , Greece and others joined in from 1915 onward. In April 1917,

18693-558: The Ottomans' territory in the Balkans during the 1912–1913 First Balkan War , much to the surprise of outside observers. The Serbian capture of ports on the Adriatic resulted in partial Austrian mobilisation, starting on 21 November 1912, including units along the Russian border in Galicia . The Russian government decided not to mobilise in response, unprepared to precipitate a war. The Great Powers sought to re-assert control through

18894-613: The Russian Stavka agreed with the French to attack Germany within fifteen days of mobilisation, ten days before the Germans had anticipated, although it meant the two Russian armies that entered East Prussia on 17 August did so without many of their support elements. By the end of 1914, German troops held strong defensive positions inside France, controlled the bulk of France's domestic coalfields, and inflicted 230,000 more casualties than it lost itself. However, communications problems and questionable command decisions cost Germany

19095-670: The Russian front lines: Scattered across the rear of 3rd Army: Army Reserve: 49°42′N 21°12′E  /  49.7°N 21.2°E  / 49.7; 21.2 World War I World War I or the First World War (28 July 1914 – 11 November 1918), also known as the Great War , was a global conflict between two coalitions: the Allies (or Entente) and the Central Powers . Fighting took place mainly in Europe and

19296-650: The Serbian retreat toward the Adriatic coast in the Battle of Mojkovac on 6–7 January 1916, but ultimately the Austrians also conquered Montenegro. The surviving Serbian soldiers were evacuated to Greece. After the conquest, Serbia was divided between Austro-Hungary and Bulgaria. In late 1915, a Franco-British force landed at Salonica in Greece to offer assistance and to pressure its government to declare war against

19497-499: The United States into the conflict. With the growing discontent of the German public due to the food shortages, the government resumed unrestricted submarine warfare in February 1917. They calculated that a successful submarine and warship siege of Britain would force that country out of the war within six months, while American forces would take a year to become a serious factor on the Western Front. The submarine and surface ships had

19698-561: The Vistula and the Bug (therefore, A. von Mackensen considered the offensive of his army group in July–August 1915 to be a continuation of the Gorlice–Tarnów offensive ). The last goal, not achieved as a result of the Russian counterattack at Kraśnik , became the limit of the development of the Gorlice–Tarnów offensive, since, firstly, the further actions of the Central Powers against Russia became

19899-571: The West was very successful. By the end of August, the Allied left, which included the British Expeditionary Force (BEF), was in full retreat , and the French offensive in Alsace-Lorraine was a disastrous failure, with casualties exceeding 260,000. German planning provided broad strategic instructions while allowing army commanders considerable freedom in carrying them out at the front, but von Kluck used this freedom to disobey orders, opening

20100-447: The Western Front was against the French near the Belgian town of Ypres . The Germans had already deployed gas against the Russians in the east at the Battle of Humin-Bolimów . Despite the German plans to maintain the stalemate with the French and British, Albrecht, Duke of Württemberg , commander of the 4th Army planned an offensive at Ypres, site of the First Battle of Ypres in November 1914. The Second Battle of Ypres , April 1915,

20301-824: The XLI Reserve Corps led by Hermann von François , Austro-Hungarian VI Corps led by Arthur Arz , and the Guards Corps led by Karl von Plettenberg , deployed south to north, while the X Corps was held in reserve. Joseph Ferdinand's Fourth Army was deployed north of the Germans at Gromnik. The Russian Third Army was deployed with the X Corps led by Nikolai Protopopov, XXI Corps led by Jakov Shchkinsky, and IX Corps led by Dmitry Shcherbachev , deployed south to north. Falkenhayn moved German Supreme Headquarters, OHL ( Oberste Heeresleitung ), to Pless in Silesia, an hour's drive from Austrian headquarters. To prevent spying,

20502-485: The Younger . Under Schlieffen, 85% of German forces in the west were assigned to the right wing, with the remainder holding along the frontier. By keeping his left-wing deliberately weak, he hoped to lure the French into an offensive into the "lost provinces" of Alsace-Lorraine , which was the strategy envisaged by their Plan XVII . However, Moltke grew concerned that the French might push too hard on his left flank and as

20703-472: The ability of the Russian Army to mount offensives in future..." Falkenhayn wrote Conrad on 13 April, "Your excellency knows that I do not consider advisable a repetition of the attempt to surround the Russian extreme (right) wing. It seems to me just as ill-advised to distribute any more German troops on the Carpathian front for the sole purpose of supporting it. On the other hand, I should like to submit

20904-446: The aggressor, German Chancellor Bethmann Hollweg delayed the commencement of war preparations until 31 July. That afternoon, the Russian government were handed a note requiring them to "cease all war measures against Germany and Austria-Hungary" within 12 hours. A further German demand for neutrality was refused by the French who ordered general mobilization but delayed declaring war. The German General Staff had long assumed they faced

21105-474: The attack by the Austro-Hungarian army under Mackensen's army of 250,000 that was already underway. Serbia was conquered in a little more than a month, as the Central Powers, now including Bulgaria, sent in 600,000 troops in total. The Serbian army, fighting on two fronts and facing certain defeat, retreated into northern Albania . The Serbs suffered defeat in the Battle of Kosovo . Montenegro covered

21306-485: The attackers were through the three trench lines that had opposed them, by 9 May they had reached all assigned objectives. Grand Duke Nicholas permitted a limited withdrawal, but rejected advice to construct a well fortified position far behind the frontline and then to pull back to it. At this point the Russian counterattacks grew ever more desperate, often throwing brand new recruits into battle, some armed only with grenades or wooden clubs. On 6 May, Mackensen noted, "Along

21507-401: The battle continued throughout July and August, with some success for the British despite the reinforcement of the German lines. By August, General Haig had concluded that a breakthrough was unlikely and instead, switched tactics to a series of small unit actions. The effect was to straighten out the front line, which was thought necessary in preparation for a massive artillery bombardment with

21708-499: The battle took place in October and early November, again producing limited gains with heavy loss of life. All told, the Somme battle had made penetrations of only 8 kilometres (5 mi) and failed to reach the original objectives. The British had suffered about 420,000 casualties and the French around 200,000. It is estimated that the Germans lost 465,000, although this figure is controversial. The Somme led directly to major new developments in infantry organisation and tactics; despite

21909-470: The battle, according to Buttar, the Russian "X and XXIV Corps had effectively ceased to exist, while IX Corps had lost 80 per cent of its establishment strength," and the III Caucasian Corps had lost two thirds of its fighting strength. On 10 May, Vladimir Dragomirov had written Grand Duke Nicholas, "The strategic position of our forces is hopeless. In particular, I consider it my duty to note

22110-593: The beginning of the war were officially buried. At the same time, the foundation was laid for the creation of a network of war memorials. The Gorlice–Tarnów offensive and the subsequent offensive of the Northern armies of the AOK in Galicia is regarded as the largest, if not the main, victory of the Central Powers in the Russian theater of operations. For 10 weeks, the Russian armies of the Southwestern Front and

22311-543: The best way of achieving this. However, the Foreign Ministry had no solid proof of Serbian involvement. On 23   July, Austria delivered an ultimatum to Serbia, listing ten demands made intentionally unacceptable to provide an excuse for starting hostilities. Serbia ordered general mobilization on 25   July, but accepted all the terms, except for those empowering Austrian representatives to suppress "subversive elements" inside Serbia, and take part in

22512-483: The border and pre-empt such a move. To avoid violating Belgian neutrality, he was told any advance could come only after a German invasion. Instead, the French cabinet ordered its Army to withdraw 10 km behind the German frontier, to avoid provoking war. On 2 August, Germany occupied Luxembourg and exchanged fire with French units when German patrols entered French territory; on 3   August, they declared war on France and demanded free passage across Belgium, which

22713-486: The campaign saw the first use of anti-aircraft warfare after an Austrian plane was shot down with ground-to-air fire, as well as the first medical evacuation by the Serbian army. Upon mobilisation, in accordance with the Schlieffen Plan , 80% of the German Army was located on the Western Front, with the remainder acting as a screening force in the East. Rather than a direct attack across their shared frontier,

22914-548: The campaigning season for 1915, starting in early May and only ending due to bad weather in October. Mackensen viewed securing a breakthrough as the first phase of an operation, which would then lead to a Russian retreat from the Dukla Pass , and their positions north of the Vistula . In the early months of war on the Eastern Front, the German Eighth Army conducted a series of almost miraculous actions against

23115-649: The capital of the recently annexed Bosnia and Herzegovina . Cvjetko Popović , Gavrilo Princip , Nedeljko Čabrinović , Trifko Grabež , Vaso Čubrilović ( Bosnian Serbs ) and Muhamed Mehmedbašić (from the Bosniaks community), from the movement known as Young Bosnia , took up positions along the Archduke's motorcade route, to assassinate him. Supplied with arms by extremists within the Serbian Black Hand intelligence organisation, they hoped his death would free Bosnia from Austrian rule. Čabrinović threw

23316-466: The chance of a decisive outcome, while it had failed to achieve the primary objective of avoiding a long, two-front war. As was apparent to several German leaders, this amounted to a strategic defeat; shortly after the First Battle of the Marne , Crown Prince Wilhelm told an American reporter "We have lost the war. It will go on for a long time but lost it is already." On 30 August 1914, New Zealand occupied German Samoa (now Samoa ). On 11 September,

23517-569: The chief of staff of the Austro-Hungarian Army, attacked the Russians in an attempt to push them back. Both sides suffered appallingly, but the Russians held their line. By this time half of the Austro-Hungarian Army that had entered the war were casualties. Conrad pleaded for additional German reinforcements to hold the passes. German Chief of German Great General Staff Erich von Falkenhayn refused, but in April 1915 Conrad threatened

23718-520: The cost of 199 submarines. World War I also saw the first use of aircraft carriers in combat, with HMS  Furious launching Sopwith Camels in a successful raid against the Zeppelin hangars at Tondern in July 1918, as well as blimps for antisubmarine patrol. Faced with Russia in the east, Austria-Hungary could spare only one-third of its army to attack Serbia. After suffering heavy losses,

23919-522: The creation of new independent states, including Poland , Finland , the Baltic states , Czechoslovakia , and Yugoslavia . The League of Nations was established to maintain world peace, but its failure to manage instability during the interwar period contributed to the outbreak of World War II in 1939. Before World War II , the events of 1914–1918 were generally known as the Great War or simply

24120-449: The creation of strong defensive systems largely impervious to massed infantry advances, such as barbed wire , machine guns and above all far more powerful artillery , which dominated the battlefield and made crossing open ground extremely difficult. Both sides struggled to develop tactics for breaching entrenched positions without heavy casualties. In time, technology enabled the production of new offensive weapons, such as gas warfare and

24321-512: The creation of the Eleventh Army. According to Buttar, the Eleventh Army would consist of the "...Guards Corps reinforced by the 119th Division, XLI Reserve Corps reinforced by 11th Bavarian Infantry Division, and X Corps. Archduke Joseph Ferdinand's Fourth Army would be subordinated to the new German army. Eventually, 119th Infantry Division and 11th Bavarian Infantry Division were grouped together in Korps Kneussl , and additional troops in

24522-466: The creeping barrage moved too fast for the French troops. Within a week the French suffered 120,000 casualties. Despite the casualties and his promise to halt the offensive if it did not produce a breakthrough, Nivelle ordered the attack to continue into May. On 3 May the weary French 2nd Colonial Division, veterans of the Battle of Verdun, refused orders, arriving drunk and without their weapons. Lacking

24723-965: The crowds listened to music and drank wine, as if nothing had happened." Nevertheless, the impact of the murder of the heir to the throne was significant, and has been described by historian Christopher Clark as a "9/11 effect, a terrorist event charged with historic meaning, transforming the political chemistry in Vienna". Austro-Hungarian authorities encouraged subsequent anti-Serb riots in Sarajevo . Violent actions against ethnic Serbs were also organised outside Sarajevo, in other cities in Austro-Hungarian-controlled Bosnia and Herzegovina, Croatia and Slovenia. Austro-Hungarian authorities in Bosnia and Herzegovina imprisoned approximately 5,500 prominent Serbs, 700 to 2,200 of whom died in prison. A further 460 Serbs were sentenced to death. A predominantly Bosniak special militia known as

24924-412: The cumulative weakening of the armies in the west led to the return of mobility in 1918. The German spring offensive of 1918 was made possible by the Treaty of Brest-Litovsk that ended the war of the Central Powers against Russia and Romania on the Eastern Front . Using short, intense "hurricane" bombardments and infiltration tactics , the German armies moved nearly 100 kilometres (60 miles) to

25125-464: The divisional level. Members of the German high command viewed this new scheme with some favour and it later became the basis of an elastic defence in depth doctrine against entente attacks. During the autumn of 1915, the " Fokker Scourge " began to have an effect on the battlefront as entente reconnaissance aircraft were nearly driven from the skies. These reconnaissance aircraft were used to direct gunnery and photograph enemy fortifications but now

25326-519: The end of the war. It also inaugurated the cult of the ace , the most famous being Manfred von Richthofen (the Red Baron). Contrary to the myth, anti-aircraft fire claimed more kills than fighters. The final entente offensive of the spring was the Second Battle of Artois , an offensive to capture Vimy Ridge and advance into the Douai plain. The French Tenth Army attacked on 9 May after

25527-439: The enemy and his underestimation, distrust of the troops and individual commanders. All this resulted in the fact that “on the Russian side, there were, as it were, two independent organisms – the high command. … and the troops with their commanders", and "the doctrine of a concentrated strike, preached in the Russian army throughout the nineteenth century, in practice resulted in separately operating tentacles. Seeckt proposed that

25728-503: The entente were nearly blinded by German fighters. However, the impact of German air superiority was diminished by their primarily defensive doctrine in which they tended to remain over their own lines, rather than fighting over entente held territory. In September 1915 the entente launched another offensive, with the French Third Battle of Artois , Second Battle of Champagne and the British at Loos. The French had spent

25929-576: The entire line from the Vistula far into the Carpathians, the enemy is retreating. Today I calculate we already have 60,000 prisoners." By 11 May, Emmich's men had reached the outskirts of Sanok , while François' reached the San River , an advance of 60 miles (97 km) in ten days. Mackensen's objective then became the securing of the San line, before advancing onwards to Rawa-Ruska . At this stage of

26130-695: The expansion of the French colonial empire . In 1873, Bismarck negotiated the League of the Three Emperors , which included Austria-Hungary , Russia and Germany. After the 1877–1878 Russo-Turkish War , the League was dissolved due to Austrian concerns over the expansion of Russian influence in the Balkans , an area they considered to be of vital strategic interest. Germany and Austria-Hungary then formed

26331-567: The failure on the Shell Crisis of 1915 , despite the early success. All sides had signed the Hague Conventions of 1899 and 1907 , which prohibited the use of chemical weapons in warfare. In 1914, there had been small-scale attempts by both the French and Germans to use various tear gases , which were not strictly prohibited by the early treaties but which were also ineffective. The first use of more lethal chemical weapons on

26532-400: The first time on the Western Front. Several types of gas soon became widely used by both sides and though it never proved a decisive, battle-winning weapon, it became one of the most feared and best-remembered horrors of the war. In February 1916, the Germans attacked French defensive positions at the Battle of Verdun , lasting until December 1916. Casualties were greater for the French, but

26733-493: The following plan of operations for your consideration...An army of at least eight German divisions will be got ready with strong artillery here in the west, and entrained for Muczyn- Grybów - Bochnia , to advance from about the line Gorlice - Gromnik in the general direction of Sanok ." Conrad met Falkenhayn in Berlin on 14 April, where final details of Falkenhayn's plan were agreed upon, and two days later orders were issued for

26934-559: The form of the Austro-Hungarian VI Corps were added to the Eleventh Army." Buttar goes on to state, "Impressed by the resilience of German troops on the Western Front when the French attacked in late 1914 and again in early 1915, Falkenhayn had adopted the proposal of Oberst Ernst von Wrisberg...and ordered some divisions to give up one of their four regiments and to reduce their artillery batteries from six guns to four." These forces were used to create new divisions for

27135-595: The front. Serbian and French troops finally made a breakthrough in September 1918 in the Vardar offensive , after most German and Austro-Hungarian troops had been withdrawn. The Bulgarians were defeated at the Battle of Dobro Pole , and by 25 September British and French troops had crossed the border into Bulgaria proper as the Bulgarian army collapsed. Bulgaria capitulated four days later, on 29 September 1918. The German high command responded by despatching troops to hold

27336-408: The globe, some of which were subsequently used to attack Allied merchant shipping . These were systematically hunted down by the Royal Navy, though not before causing considerable damage. One of the most successful was the SMS  Emden , part of the German East Asia Squadron stationed at Qingdao , which seized or sank 15 merchantmen, a Russian cruiser and a French destroyer. Most of the squadron

27537-421: The high ground, while their trenches tended to be better built; those constructed by the French and English were initially considered "temporary", only needed until an offensive would destroy the German defences. Both sides tried to break the stalemate using scientific and technological advances. On 22 April 1915, at the Second Battle of Ypres , the Germans (violating the Hague Convention ) used chlorine gas for

27738-456: The infantry set off from their assault positions precisely at 10 o'clock." Mackensen had already defined "lines that should be reached in a uniform and if possible simultaneous manner, without preventing the troops from collectively moving on to secure the next sector where possible." After the first day, Mackensen reported, So far, everything is proceeding well", and on 3 May he reported 12,000 prisoners had been captured. François reported, "Gorlice

27939-445: The intervals when the blades of the propeller are out of the line of fire. This advance was quickly ushered into service, in the Fokker E.I ( Eindecker , or monoplane, Mark 1), the first single seat fighter aircraft to combine a reasonable maximum speed with an effective armament. Max Immelmann scored the first confirmed kill in an Eindecker on 1 August. Both sides developed improved weapons, engines, airframes and materials, until

28140-422: The investigation and trial of Serbians linked to the assassination. Claiming this amounted to rejection, Austria broke off diplomatic relations and ordered partial mobilisation the next day; on 28 July, they declared war on Serbia and began shelling Belgrade . Russia ordered general mobilization in support of Serbia on 30 July. Anxious to ensure backing from the SPD political opposition by presenting Russia as

28341-437: The left flank of the armies of the Northwestern Front were thrown back in Galicia – across the Bug, Zlota Lipa and Dniester rivers, retaining only a small part of the Austria-Hungary’s territory, and in the Kingdom of Poland they retreated beyond the Vistula to Józefów , across the Tanew River, to Krasnystaw and Hrubieszów – approximately to the lines from which the Russian invasion of Galicia began in August 1914. Almost all

28542-510: The line, but these forces were too weak to re-establish a front. Western Front (World War I) Military dead: 1,495,000 1915 1916 1917 1918 Associated articles The Western Front was one of the main theatres of war during the First World War . Following the outbreak of war in August 1914, the German Army opened the Western Front by invading Luxembourg and Belgium , then gaining military control of important industrial regions in France . The German advance

28743-443: The local inhabitants were moved out of the buildup area. In the north the German Ninth and Tenth armies made diversionary attacks that threatened Riga. On 22 April, the Germans launched the first poison gas attack near Ypres , divulging what might have been a decisive weapon merely to distract the Allies in the west. Mackensen had ten infantry and one cavalry divisions (126,000 men, 457 light guns, 159 heavy pieces, and 96 mortars) along

28944-402: The main assault and two corps performing diversionary attacks at Ypres. The British suffered heavy losses, especially due to machine gun fire during the attack and made only limited gains before they ran out of shells. A renewal of the attack on 13 October fared little better. In December, French was replaced by General Douglas Haig as commander of the British forces. Falkenhayn believed that

29145-454: The means to punish an entire division, its officers did not immediately implement harsh measures against the mutineers. Mutinies occurred in 54 French divisions and 20,000 men deserted. Other entente forces attacked but suffered massive casualties. Appeals to patriotism and duty followed, as did mass arrests and trials. The French soldiers returned to defend their trenches but refused to participate in further offensive action. On 15 May Nivelle

29346-422: The more deadly phosgene gas in 1915, then the infamous mustard gas in 1917, which could linger for days and could kill slowly and painfully. Countermeasures also improved and the stalemate continued. Specialised aeroplanes for aerial combat were introduced in 1915. Aircraft were already in use for scouting and on 1 April, the French pilot Roland Garros became the first to shoot down an enemy aircraft by using

29547-452: The most costly of these offensives were the Battle of Verdun , in 1916, with a combined 700,000 casualties, the Battle of the Somme , also in 1916, with more than a million casualties, and the Battle of Passchendaele , in 1917, with 487,000 casualties. To break the deadlock of the trench warfare on the Western Front, both sides tried new military technology , including poison gas , aircraft, and tanks . The adoption of better tactics and

29748-412: The new Eleventh Army. Conrad had to bow to Falkenhayn's conditions. The joint attack would be by an Austro-German Army Group commanded by a German, whose orders from Falkenhayn would be transmitted via the Austro-Hungarian command. The Group would contain the Austro-Hungarian Fourth Army (eight infantry and one cavalry divisions) under Archduke Joseph Ferdinand , an experienced soldier. The Germans formed

29949-409: The ocean, even to neutral ships. Since there was limited response to this tactic, Germany expected a similar response to its unrestricted submarine warfare. The Battle of Jutland in May/June 1916 was the only full-scale clash of battleships during the war, and one of the largest in history. The clash was indecisive, though the Germans inflicted more damage than they received; thereafter the bulk of

30150-436: The opposing forces made reciprocal outflanking manoeuvres, known as the Race to the Sea and quickly extended their trench systems from the Swiss frontier to the North Sea . The territory occupied by Germany held 64 percent of French pig-iron production , 24 percent of its steel manufacturing and 40 percent of the coal industry – dealing a serious blow to French industry. On the entente side (those countries opposing

30351-459: The original aim of capturing the ridges east of Ypres then advancing to Roulers and Thourout to close the main rail line supplying the German garrisons on the Western front north of Ypres. If successful the northern armies were then to capture the German submarine bases on the Belgian coast. It was later restricted to advancing the British Army onto the ridges around Ypres, as the unusually wet weather slowed British progress. The Canadian Corps relieved

30552-482: The position of Fourth Army, which will become very dangerous if the enemy breaks through along the lower San." On 12 May, Mackensen ordered bridgeheads established at Jaroslau and Radymno . By 15 May, Jaroslau had been captured and the Germans started crossing the San there on 17 May. Radymno was captured on 24 May. Dimitriev's Third Army XXI and XII Corps were transferred under the control of Aleksei Brusilov 's Eighth Army in an attempt by Grand Duke Nicholas to stem

30753-732: The pressure step by step, evacuating both Galicia and the Polish salient to straighten out their front line, hoping to buy the time to acquire the weapons they so desperately needed, for example 300,000 rifles. This enormous movement is known as the Great Retreat of 1915 . Warsaw was evacuated and fell to the new Twelfth German Army on 5 August, and by the end of the month Poland was entirely in Austro-German hands (see Bug-Narew Offensive ). Central Powers (arrayed north to south): Austro-Hungarian 4th Army (Austro-Hungarian units unless otherwise indicated): German 11th Army (German units unless otherwise indicated): Austro-Hungarian 3rd Army , Russian 3rd Army (north to south): Behind

30954-415: The previous day was spent bringing forward their heavy artillery with matching aerial reconnaissance . The Russians reverted to a headlong retreat, and on 21 June the Grand Duke Nicholas ordered abandonment of Galicia. On 22 June Mackensen's Austro-Hungarians entered Lemberg after an advance of 310 km (190 mi), an average rate of 5.8 km (3.6 mi) per day. The Galician oil fields, crucial for

31155-681: The protection of the " cruiser rules ", which demanded warning and movement of crews to "a place of safety" (a standard that lifeboats did not meet). Finally, in early 1917, Germany adopted a policy of unrestricted submarine warfare , realising the Americans would eventually enter the war. Germany sought to strangle Allied sea lanes before the United States could transport a large army overseas, but, after initial successes, eventually failed to do so. The U-boat threat lessened in 1917, when merchant ships began travelling in convoys , escorted by destroyers . This tactic made it difficult for U-boats to find targets, which significantly lessened losses; after

31356-409: The rear remained abandoned. The low stability of the troops of the Russian 8th Army, which left Lvov on June 22, became the reason for sharp reprimands from the front headquarters. In the Russian armies south of the Pilica River, 26 infantry divisions were transferred and put into battle in 70 days, two more guard divisions remained in reserve. But for the armies of the Central Powers, the victory came at

31557-403: The replenishment of combat and non-combat сasualties – 4.5 million men on both sides), in terms of сasualties of the opponents (on both sides more than 1.5 million men), in terms of trophies, became the largest during the First World War. Heavy сasualties in the May battles forced the Russian armies to retreat from Galicia in early June 1915, and so hastily that the fortified positions prepared in

31758-454: The replenishment that came to the front was destroyed in the battles. The Russian Imperial army for the first time completely switched to strategic defense. The armies of the Central Powers failed to encircle the Russian armies and withdraw the Russian Empire from the war, but such a goal was not set before the start of the Gorlice–Tarnów offensive. The planning of the operation in Galicia by the AOK and Ober Ost, proceeded in stages, depending on

31959-419: The result achieved. At first, the goal was to oust the Russian armies from the Carpathian ridge, which was achieved after the retreat of the Russian troops behind the San and Dniester rivers; then the task of recapturing central Galicia and Przemysl was set, followed by the capture of Lemberg and the liberation of eastern Galicia. Finally, the goal was set to push the Russian troops as far north as possible between

32160-450: The ridge and the Third Army to the south achieved the deepest advance since trench warfare began. Later attacks were confronted by German reinforcements defending the area using the lessons learned on the Somme in 1916. British attacks were contained and, according to Gary Sheffield, a greater rate of daily loss was inflicted on the British than in "any other major battle". During the winter of 1916–1917, German air tactics had been improved,

32361-457: The ridge, and about 500 t (490 long tons) of explosives had been planted in 21 mines under the German defences. Following several weeks of bombardment, the explosives in 19 of these mines were detonated, killing up to 7,000 German troops. The infantry advance that followed relied on three creeping barrages which the British infantry followed to capture the plateau and the east side of the ridge in one day. German counter-attacks were defeated and

32562-438: The same time, the Austro-Hungarian Army launched a series of attacks collectively known as the Battle of Galicia that were initially successful but soon turned into a retreat that did not stop until reaching the Carpathian Mountains in late September. Over the next weeks, Russian troops continued to press forward into the Carpathian passes in the south of Galicia . In fierce winter fighting General Franz Conrad von Hötzendorf ,

32763-413: The shortcomings of the Russian troops command and control system: the lack of a single plan of action (and as a result, the initiative was ceded to the enemy), neglect of assessing the capabilities of the terrain and the position of the troops (as a result – "throwing suitable reserves from side to side"), weakness of technical training (creation of reserves, organization of supplies), biased attitude towards

32964-405: The south of Ypres, where the 16th (Irish) Division withstood several German gas attacks. The British retaliated, developing their own chlorine gas and using it at the Battle of Loos in September 1915. Fickle winds and inexperience led to more British casualties from the gas than German. French, British and German forces all escalated the use of gas attacks through the rest of the war, developing

33165-424: The southern flank of the Gheluvelt plateau was protected from German observation. On 11 July 1917, during Unternehmen Strandfest (Operation Beachparty) at Nieuport on the coast, the Germans introduced a new weapon into the war when they fired a powerful blistering agent Sulfur mustard (Yellow Cross) gas. The artillery deployment allowed heavy concentrations of the gas to be used on selected targets. Mustard gas

33366-431: The spring, entente commanders had been concerned about the ability of the French Army to withstand the enormous losses at Verdun. The original plans for an attack around the River Somme were modified to let the British make the main effort. This would serve to relieve pressure on the French, as well as the Russians who had also suffered great losses. On 1 July, after a week of heavy rain, British divisions in Picardy began

33567-417: The summer preparing for this action, with the British assuming control of more of the front to release French troops for the attack. The bombardment, which had been carefully targeted by means of aerial photography , began on 22 September. The main French assault was launched on 25 September and, at first, made good progress in spite of surviving wire entanglements and machine gun posts. Rather than retreating,

33768-441: The summer, the French slowly advanced. With the development of the rolling barrage , the French recaptured Fort Vaux in November and by December 1916 they had pushed the Germans back 2.1 kilometres (1.3 mi) from Fort Douaumont, in the process rotating 42 divisions through the battle. The Battle of Verdun—also known as the 'Mincing Machine of Verdun' or 'Meuse Mill' —became a symbol of French determination and self-sacrifice. In

33969-415: The term First World War was in September 1914 by German biologist and philosopher Ernst Haeckel who stated, "There is no doubt that the course and character of the feared 'European War' ... will become the first world war in the full sense of the word." For much of the 19th century, the major European powers maintained a tenuous balance of power , known as the Concert of Europe . After 1848, this

34170-419: The terrible losses of 1 July, some divisions had managed to achieve their objectives with minimal casualties. In examining the reasons behind losses and achievements, once the British war economy produced sufficient equipment and weapons, the army made the platoon the basic tactical unit, similar to the French and German armies. At the time of the Somme, British senior commanders insisted that the company (120 men)

34371-584: The threat posed by the closing of this gap was more important than competing with the Royal Navy. After Germany expanded its standing army by 170,000 troops in 1913, France extended compulsory military service from two to three years; similar measures were taken by the Balkan powers and Italy, which led to increased expenditure by the Ottomans and Austria-Hungary. Absolute figures are difficult to calculate due to differences in categorising expenditure since they often omit civilian infrastructure projects like railways which had logistical importance and military use. It

34572-414: The trenches in divisional strength until October. The incoming troops required training and equipment before they could join in the effort, and for several months American units were relegated to support efforts. Despite this, however, their presence provided a much-needed boost to entente morale, with the promise of further reinforcements that could tip the manpower balance towards the entente. In June,

34773-409: The two Russian armies facing them. After surrounding and then destroying the Russian Second Army at the Battle of Tannenberg in late August, Paul von Hindenburg and Erich Ludendorff wheeled their troops to face the Russian First Army at the First Battle of the Masurian Lakes , almost destroying them before they reached the protection of their own fortresses as they retreated across the border. At

34974-416: The war by negotiated settlements, Germany could concentrate on Britain and fight a long war with the resources of Europe at its disposal. Hindenburg and Ludendorff continued to believe that Russia could be defeated by a series of battles which cumulatively would have a decisive effect, after which Germany could finish off France and Britain. Trench warfare in 1914, while not new, quickly improved and provided

35175-429: The war ended with the Armistice of 11 November 1918 . The Paris Peace Conference of 1919–1920 imposed settlements on the defeated powers, most notably the Treaty of Versailles , by which Germany lost significant territories, was disarmed, and was required to pay large war reparations to the Allies. The dissolution of the Russian, German, Austro-Hungarian, and Ottoman Empires redrew national boundaries and resulted in

35376-413: The war involved British, French, and German colonial forces in Africa. On 6–7 August, French and British troops invaded the German protectorates of Togoland and Kamerun . On 10 August, German forces in South-West Africa attacked South Africa; sporadic and fierce fighting continued for the rest of the war. The German colonial forces in German East Africa , led by Colonel Paul von Lettow-Vorbeck , fought

35577-457: The war." On 20 November the British launched the first massed tank attack and the first attack using predicted artillery-fire (aiming artillery without firing the guns to obtain target data) at the Battle of Cambrai . The entente attacked with 324 tanks (with one-third held in reserve) and twelve divisions, advancing behind a hurricane bombardment, against two German divisions. The machines carried fascines on their fronts to bridge trenches and

35778-418: The west , which despite initial successes left the German Army exhausted and demoralised. A successful Allied counter-offensive from August 1918 caused a collapse of the German front line. By early November, Bulgaria, the Ottoman Empire and Austria-Hungary had each signed armistices with the Allies, leaving Germany isolated. Facing a revolution at home , Kaiser Wilhelm   II abdicated on 9 November, and

35979-407: The west would go over to the strategic defensive for most of 1917, while the Central Powers would attack elsewhere. During the Somme battle and through the winter months, the Germans created a fortification behind the Noyon Salient that would be called the Hindenburg Line, using the defensive principles elaborated since the defensive battles of 1915, including the use of Eingreif divisions . This

36180-406: The west, the deepest advance by either side since 1914, but the success was short-lived. The unstoppable advance of the entente armies during the Hundred Days Offensive of 1918 caused a sudden collapse of the German armies and persuaded the German commanders that defeat was inevitable. The German government surrendered in the Armistice of 11 November 1918 , and the terms of peace were settled by

36381-415: Was a continued advance towards the east from a bridgehead at Magierów , and the ultimate recapture of Lemberg , which would sever lines of communication between the Russian Northwest and Southwest Fronts. Mackensen would not only command his Eleventh Army but also the Austro-Hungarian Fourth Army, augmented with the X and XVII Corps, on his northern flank, and the Austro-Hungarian Second Army, augmented with

36582-432: Was a major factor in the deadly Spanish flu pandemic. The causes of World War I included the rise of Germany and decline of the Ottoman Empire , which disturbed the long-standing balance of power in Europe, as well as economic competition between nations triggered by industrialisation and imperialism . Growing tensions between the great powers and in the Balkans reached a breaking point on 28 June 1914, when

36783-470: Was almost demolished; the section of the town that had been fighting resembled a sea of ruins." Mackensen then issued orders for the advance upon the River Wisłoka as the next objective, which constituted the Russian third and final line of defense. In the meantime, Russian reserves in the form of the III Caucasian Corps, could not provide relief for at least a day. Yet, since this corps was committed to battle piecemeal, they proved of limited value in hindering

36984-403: Was challenged by Britain's withdrawal into so-called splendid isolation , the decline of the Ottoman Empire , New Imperialism , and the rise of Prussia under Otto von Bismarck . Victory in the 1870–1871 Franco-Prussian War allowed Bismarck to consolidate a German Empire . Post-1871, the primary aim of French policy was to avenge this defeat, but by the early 1890s, this had switched to

37185-413: Was encountered. The Germans took Fort Douaumont and then reinforcements halted the German advance by 28 February. The Germans turned their focus to Le Mort Homme on the west bank of the Meuse which blocked the route to French artillery emplacements, from which the French fired across the river. After some of the most intense fighting of the campaign, the hill was taken by the Germans in late May. After

37386-639: Was halted with the Battle of the Marne . Following the Race to the Sea , both sides dug in along a meandering line of fortified trenches , stretching from the North Sea to the Swiss frontier with France, the position of which changed little except during early 1917 and again in 1918. Between 1915 and 1917 there were several offensives along this front . The attacks employed massive artillery bombardments and massed infantry advances. Entrenchments, machine gun emplacements, barbed wire , and artillery repeatedly inflicted severe casualties during attacks and counter-attacks and no significant advances were made. Among

37587-423: Was intended to divert attention from offensives in the Eastern Front and disrupt Franco-British planning. After a two-day bombardment, the Germans released a lethal cloud of 168 long tons (171 t) of chlorine onto the battlefield. Though primarily a powerful irritant, it can asphyxiate in high concentrations or prolonged exposure. Being heavier than air, the gas crept across no man's land and drifted into

37788-426: Was intended to shorten the German front, freeing 10 divisions for other duties. This line of fortifications ran from Arras south to St Quentin and shortened the front by about 50 kilometres (30 mi). British long-range reconnaissance aircraft first spotted the construction of the Hindenburg Line in November 1916. The Hindenburg Line was built between 2 mi (3.2 km) and 30 mi (48 km) behind

37989-416: Was launched on 14 August with the First and Second Armies attacking toward Sarrebourg-Morhange in Lorraine. In keeping with the Schlieffen Plan, the Germans withdrew slowly while inflicting severe losses upon the French. The French Third and Fourth Armies advanced toward the Saar and attempted to capture Saarburg, attacking Briey and Neufchateau but were repulsed. The French VII Corps captured Mulhouse after

38190-402: Was no longer possible for Germany to win the war by purely military means and on 18 November 1914 he called for a diplomatic solution. The Chancellor, Theobald von Bethmann Hollweg ; Generalfeldmarschall Paul von Hindenburg , commanding Ober Ost (Eastern Front high command); and his deputy, Erich Ludendorff , continued to believe that victory was achievable through decisive battles. During

38391-436: Was persistent and could contaminate an area for days, denying it to the British, an additional demoralising factor. The entente powers increased production of gas for chemical warfare but took until late 1918 to copy the Germans and begin using mustard gas. From 31 July to 10 November the Third Battle of Ypres included the First Battle of Passchendaele and culminated in the Second Battle of Passchendaele . The battle had

38592-404: Was provided with a strong train of heavy artillery commanded by Generalmajor Alfred Ziethen, which included the huge German and Austro-Hungarian mortars that had crushed French and Belgian fortresses. Airplanes were provided to direct artillery fire, which was especially important since ammunition was short on both sides: only 30,000 shells could be stockpiled for the attack. Another significant plus

38793-654: Was refused. Early on the morning of 4   August, the Germans invaded, and Albert I of Belgium called for assistance under the Treaty of London . Britain sent Germany an ultimatum demanding they withdraw from Belgium; when this expired at midnight, without a response, the two empires were at war. Germany promised to support Austria-Hungary's invasion of Serbia, but interpretations of what this meant differed. Previously tested deployment plans had been replaced early in 1914, but those had never been tested in exercises. Austro-Hungarian leaders believed Germany would cover its northern flank against Russia. Beginning on 12 August,

38994-422: Was removed from command, replaced by Pétain who immediately stopped the offensive. The French would go on the defensive for the following months to avoid high casualties and to restore confidence in the French High Command, while the British assumed greater responsibility. On 25 June the first US troops began to arrive in France, forming the American Expeditionary Force . However, the American units did not enter

39195-403: Was repeated two days later and caused a 3.1 mi (5 km) withdrawal of the Franco-British line but the opportunity had been lost. The success of this attack would not be repeated, as the entente countered by introducing gas masks and other countermeasures . An example of the success of these measures came a year later, on 27 April in the Gas attacks at Hulluch 40 km (25 mi) to

39396-600: Was returning to Germany when it sank two British armoured cruisers at the Battle of Coronel in November 1914, before being virtually destroyed at the Battle of the Falkland Islands in December. The SMS Dresden escaped with a few auxiliaries, but after the Battle of Más a Tierra , these too were either destroyed or interned. Soon after the outbreak of hostilities, Britain began a naval blockade of Germany . This proved effective in cutting off vital supplies, though it violated accepted international law. Britain also mined international waters which closed off entire sections of

39597-417: Was the Battle of Liège , a siege that lasted from 5–16 August. Liège was well fortified and surprised the German Army under Bülow with its level of resistance. German heavy artillery was able to demolish the main forts within a few days. Following the fall of Liège, most of the Belgian field army retreated to Antwerp , leaving the garrison of Namur isolated, with the Belgian capital, Brussels , falling to

39798-409: Was the German field telephone service, which advanced with the attackers, thereby enabling front-line observers to direct artillery fire. To increase their mobility on the poor roads, each German division was provided with 200 light Austro-Hungarian wagons with drivers. The German Eleventh Army was ready to start artillery operations by 1 May, with the Korps Kneussl deployed southwest of Gorlice, with

39999-586: Was the foundation of German foreign policy but in 1890, he was forced to retire by Wilhelm II . The latter was persuaded not to renew the Reinsurance Treaty by his new Chancellor , Leo von Caprivi . This gave France an opening to agree the Franco-Russian Alliance in 1894, which was then followed by the 1904 Entente Cordiale with Britain. The Triple Entente was completed by the 1907 Anglo-Russian Convention . While not formal alliances, by settling long-standing colonial disputes in Asia and Africa, British support for France or Russia in any future conflict became

40200-411: Was the smallest unit of manoeuvre; less than a year later, the section of ten men would be so. In August 1916 the German leadership along the Western Front had changed as Falkenhayn resigned and was replaced by Hindenburg and Ludendorff. The new leaders soon recognised that the battles of Verdun and the Somme had depleted the offensive capabilities of the German Army. They decided that the German Army in

40401-425: Was very effective, and massive frontal assaults cost the victorious troops dearly, which was reflected in the gradual narrowing of the breakthrough front. The available official information about the trophies of the warring parties allows to clarify the number of those who died in the operation. This number is made up of those killed and missing, not taken prisoner. The Austria-Hungary's Army Higher Command ( AOK ) and

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