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114-478: Mobilization (alternatively spelled as mobilisation ) is the act of assembling and readying military troops and supplies for war . The word mobilization was first used in a military context in the 1850s to describe the preparation of the Prussian Army . Mobilization theories and tactics have continuously changed since then. The opposite of mobilization is demobilization . Mobilization institutionalized

228-645: 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

342-592: 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,

456-540: 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

570-412: A two-front war with Russia and France. Like Russia, Germany decided to follow its two-front plans despite the one-front war. Germany declared war on France on August 3, 1914, one day after issuing an ultimatum to Belgium demanding the right of German troops to pass through as part of the planned pincer action of the military. Finally, Britain declared war on Germany for violating Belgian neutrality. Thus

684-533: A "troop" due to its presence in a cavalry squadron; this is typically the case for the dismounted reconnaissance troop (DRT) of a RSTA squadron , in which an infantry company-sized element is part of a cavalry-branched squadron. In the United States, state police forces are often regionally divided into troops. This usage came from these organizations modelling themselves on the US Army, and especially

798-541: A captain—most troop or platoon-sized elements are commanded by a lieutenant. In most cases, units which refer to platoon sized elements as troops refer to company-sized elements as squadrons and battalion-sized elements as regiments (regiments in the RAA use the term ' battery ' for company-sized elements). Privates in the Royal Australian Armoured Corps and SASR hold the rank "trooper", however this

912-408: 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

1026-459: A day by 1915. Both sides also began drawing on larger numbers of soldiers. The British Secretary of State for War, Lord Kitchener , appealed for hundreds of thousands of soldiers, which was met with an enthusiastic response. 30 new British divisions were created. The response by volunteers allowed the British to put off the introduction of conscription until 1916 . New Zealand followed suit , with Canada also eventually introducing conscription with

1140-613: 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

1254-432: A force of 2 million U.S. soldiers joined in the war effort. Poland partly mobilized its troops on August 24, 1939, and fully mobilized on August 30, 1939, following the increased confrontations with Germany since March 1939 . On September 1, 1939 Germany invaded Poland, which prompted both France and Britain to declare war on Germany. However, they were slow to mobilize, and by the time Poland had been overrun by

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1368-471: 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,

1482-593: A modern, industrialized nation preparing for war. "Colonials" served under British command though, perhaps owing to the limited autonomy granted to the Dominions regarding their respective mobilizations, the Dominions eventually compelled the British government to overrule the objections of some British commanders and let the Dominion forces serve together instead of being distributed amongst various British divisions. The "colonials" would go on to be acknowledged by both

1596-419: A national scale. Importantly, some scholars have argued that such large scale mobilization of society and its resources for the purposes of warfare have the effect of aiding in state building. Herbst argues that the demands of reacting to an external aggressor provides a strong enough impetus to force structural changes and also forge a common national identity. Troops Troops is often used to refer to

1710-697: A personal dialogue with the German Emperor in an attempt to avoid war with Germany. However, Nicholas was advised that attempts to improvise a partial mobilization would lead to chaos and probable defeat if, as pessimists on the Russian side expected, no amount of diplomacy could convince the Germans to refrain from attacking Russia whilst she was engaged with Germany's ally. On July 29, 1914, the Tsar ordered full mobilization, then changed his mind after receiving

1824-548: 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

1938-834: 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

2052-516: 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

2166-521: A telegram from Kaiser Wilhelm. Partial mobilization was ordered instead. The next day, the Tsar's foreign minister , Sergey Sazonov once more persuaded Nicholas of the need for general mobilization, and the order was issued that day, July 30. In response, Germany declared war on Russia. Germany mobilized under von Moltke the Younger 's revised version of the Schlieffen Plan , which assumed

2280-414: 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

2394-402: 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

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2508-455: 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

2622-409: Is based on the presumption that the army moves over land possessing significant agricultural production. However, due to new policies (like conscription), greater populations, and greater national wealth, the nineteenth-century army was composed of an average of 100,000 men. For example, in 1812 Napoleon led an army of 600,000 to Moscow while feeding off plentiful agricultural products introduced by

2736-482: Is estimated to have mobilized about 11% of its free population in the American Civil War (1861–1865). The Kingdom of Prussia mobilized about 6–7% of its total population in the years 1760 and 1813. The Swedish Empire mobilized 7.7% in 1709. Armies in the seventeenth century possessed an average of 20,000 men. A military force of this size requires around 20 tons of food per day, shelter, as well as all

2850-508: 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

2964-718: Is not the case for any other corps or units, which use the term troops . In the British Army the definition of a troop varies by corps . Other Army corps do not use the term. In the Royal Marines , a troop is the equivalent to an Army platoon; a carryover from the organisation of the British Commandos in World War II. In the Canadian Army , a troop is the equivalent of a platoon within

3078-574: 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

3192-641: 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

3306-695: 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

3420-847: 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 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

3534-522: The Levée en masse (engl. mass levy of conscripts ) that was first introduced during the French Revolution . It became an issue with the introduction of conscription , and the introduction of the railways in the 19th century. A number of technological and societal changes promoted the move towards a more organized way of deployment. These included the telegraph to provide rapid communication,

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3648-650: The Military Service Act in 1917. On April 6, 1917, the United States entered the war on the Allied side. At the entrance, the U.S. only could mobilize its army of 107,641 soldiers, ranked only seventeenth in size worldwide at the time. The United States Navy quickly mobilized, adding 5 dreadnoughts to the Allied navy. However, conscription quickly ensued. By March 1918, 318,000 U.S. soldiers had been mobilized to France. Eventually, by October 1918,

3762-684: The Militia (Canada's peacetime army); in 1920 the Otter Commission was compelled to sort out which units would perpetuate the units that served in the trenches—the CEF or the prewar Militia. A unique solution of perpetuations was instituted, and mobilization during the Second World War did not repeat Sir Sam Hughes' model, which has been described by historians as being more closely akin to ancient Scottish clans assembling for battle than

3876-468: The President of Russia , announced a partial mobilization on 21 September 2022 of existing reservists , most particularly those that have military experience. According to claims of the Russian defence minister Sergei Shoigu , 300,000 reservists would be mobilized. Economic mobilization is the preparation of resources for usage in a national emergency by carrying out changes in the organization of

3990-399: The President of Ukraine , signed a decree on February 24, 2022 on the general mobilization of the population in the 2022 Russian invasion of Ukraine . Conscripts and reservists were called up over the next 90 days to "ensure the defense of the state, maintaining combat and mobilization readiness". Men between the ages of 18 and 60 were prohibited from leaving the country. Vladimir Putin ,

4104-721: 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,

4218-713: 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

4332-487: 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

4446-440: The older cavalry units. For this same reason the state police and highway patrol personnel of most states are known as "troopers" rather than "officers". In Scouting , a scout troop is a unit made up of scouts or guides from the same locality under a leader . In the case of Guides, the term "company" is used more often, and was used by the founder in his first books about guiding. World War I World War I or

4560-766: 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

4674-588: 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

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4788-563: 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

4902-441: 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

5016-569: 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,

5130-646: 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

5244-700: The Axis powers, only minor operations had been carried out by the French at the Saar River . Canada actually carried out a partial mobilization on August 25, 1939, in anticipation of the growing diplomatic crisis . On September 1, 1939, the Canadian Active Service Force (a corps-sized force of two divisions) was mobilized even though war was not declared by Canada until September 10, 1939. Only one division went overseas in December 1939, and

5358-553: 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 ,

5472-592: The British and German high commands as being elite British units. In May 1918, when command of the Australian Corps passed from William Birdwood to John Monash , it became the first British Empire formation commanded totally free of British officers. On May 23, 1915, Italy entered World War I on the Allied side. Despite being the weakest of the big four Allied powers, the Italians soon managed to populate its army from 560 to 693 infantry battalions in 1916;

5586-404: 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

5700-649: 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

5814-623: 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

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5928-465: 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

6042-462: 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

6156-426: 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

6270-656: The Great Powers could only afford to keep a fraction of these men in uniform in peacetime, the rest were reservists with limited opportunities to train. Maneuvering formations of millions of men with limited military training required intricate plans with no room for error, confusion, or discretion after mobilization began. These plans were prepared under the assumption of worst-case scenarios . For example, German military leaders did not plan to mobilize for war with Russia whilst assuming that France would not come to her ally's aid, or vice versa. The Schlieffen Plan therefore dictated not only mobilization against both powers, but also

6384-565: 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

6498-703: 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 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

6612-545: 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,

6726-449: 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

6840-549: 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

6954-521: The Russian Stavka 's war planning assumed that war against either Austria-Hungary or Germany would mean war against the other power. Although the plan allowed flexibility as to whether the main effort would be made against Germany or Austria-Hungary, in either case units would be mobilized on the frontiers of both Powers. On July 28, 1914, Tsar Nicholas II of Russia (William's cousin) ordered partial mobilization against Austria-Hungary only. While war with Austria-Hungary seemed inevitable, Nicholas engaged in

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7068-429: 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

7182-406: The UK). Canada also enacted the National Resources Mobilization Act in 1940, which among other things compelled men to serve in the military, though conscripts mobilized under the NRMA did not serve overseas until 1944. Conscripts did, however, serve in the Aleutian Islands Campaign in 1943 though the anticipated Japanese defense never materialized due to the evacuation of the enemy garrison before

7296-455: 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

7410-430: 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

7524-446: 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

7638-431: The armoured, artillery, engineer, and signals branches. Two to four troops comprise the main elements of a squadron. In the United States Army , in the cavalry branch, a troop is the equivalent unit to the infantry company, commanded by a captain and consisting of three or four platoons, and are called a troop within a regiment. Companies were renamed troops in 1883. In some instances, an infantry company may be titled as

7752-459: The army had grown in size from 1 million to 1.5 million soldiers. On August 17, 1916, Romania entered the war on the Allied side, mobilizing an army of 23 divisions. Romania was quickly defeated however by Germany, Austria-Hungary, and Bulgaria . Bulgaria went so far as to ultimately mobilize 1.2 million men, more than a quarter of its population of 4.3 million people, a greater share of its population than any other country during

7866-407: 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

7980-477: 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

8094-483: 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

8208-600: 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,

8322-649: 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

8436-466: 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,

8550-520: 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,

8664-522: 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

8778-449: 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

8892-965: 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

9006-565: The entangling alliances of the Triple Alliance and the Triple Entente directed the intricate plans for mobilization. This brought all of the Great Powers of Europe into the Great War without actually utilizing the provisions of either alliance. The mobilization was like a holiday for many of the inexperienced soldiers; for example, some Germans wore flowers in the muzzles of their rifles as they marched. Trains brought soldiers to

9120-695: 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

9234-400: 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

9348-619: The front lines of battle. The Germans timetabled the movements of 11,000 trains as they brought troops across the Rhine River . The French mobilized around 7,000 trains for movement. Horses were also mobilized for war . The British had 165,000 horses prepared for cavalry , the Austrians 600,000, the Germans 715,000, and the Russians over a million. Britain's Dominions including Australia , Canada , New Zealand and South Africa were compelled to go to war when Britain did. However, it

9462-595: 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

9576-542: 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

9690-507: The government hoped to follow a "limited liability" war policy. When France was invaded in May 1940, the Canadian government realized that would not be possible and mobilized three additional divisions, beginning their overseas employment in August 1940 with the dispatch of the 2nd Canadian Division (some units of which were deployed to Iceland and Newfoundland for garrison duty before moving to

9804-549: 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

9918-435: 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 was a major factor in the deadly Spanish flu pandemic. The causes of World War I included the rise of Germany and decline of

10032-470: 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

10146-417: The lack of communication between troops, officers, and generals. Austria's army was primarily composed of Slavs , but it contained many other ethnicities as well. Austrian military instruction during peacetime utilized nine different languages, accustoming Austrian soldiers to taking orders only in their native language. Conversely, in an effort to augment the efficacy of the new " precision rifle " developed by

10260-578: The landings. Service in the Aleutians was not considered "overseas" as technically the islands were part of North America. The United Kingdom mobilized 22% of its total population for direct military service, more than any other nation in the WWII era. Up to 34 million soldiers served in the Red Army during World War II, representing the largest military force in world history. Volodymyr Zelenskyy ,

10374-564: The laws and customs of warfare then observed (not to mention the desire to avoid compromising national security), general mobilization of one nation's military forces was invariably considered an act of war by that country's likely enemies. In 1914, the United Kingdom was the only European Great Power without conscription . The other Great Powers ( Austria-Hungary , Italy , France , Germany and Russia ) all relied on compulsory military service to supply each of their armies with

10488-600: The military collectively, as in "the troops"; see Troop (disambiguation) . Today, a troop is defined differently in different armed forces. In the Australian Army a troop is the equivalent of a platoon sized element in units of certain corps, those being: The SASR is the only unit in the Royal Australian Infantry Corps to use the term troop to refer to its platoon-size elements. SASR troops are also unusual as they are commanded by

10602-483: The millions of men they believed they would need to win a major war. France enacted the " Three Year Law " (1913) to extend the service of conscripted soldiers to match the size of the German army, as the French population of 40 million was smaller than the German population of 65 million people. The Anglo-German naval arms race began, sparked by the German enactment of the Second Naval Law . Each of

10716-413: The monarchy, officers were forced to only speak German when giving orders to their men. Even one Austrian officer commented at Solferino that his troops could not even comprehend the command, "Halt." This demonstrates the communicative problems that arose quickly with the advent of the mass army. Intricate plans for mobilization contributed greatly to the beginning of World War I , since in 1914, under

10830-451: The national economy. It is reorganizing the functioning of the national economy to use resources most effectively in support of the total war effort. Typically, the available resources and productive capabilities of each nation determined the degree and intensity of economic mobilization. Thus, effectively mobilizing economic resources to support the war effort is a complex process, requiring superior coordination and productive capability on

10944-435: The necessary munitions, transportation (typically horses or mules), tools, and representative garments. Without efficient transportation, mobilizing these average-sized forces was extremely costly, time-consuming, and potentially life-threatening. Soldiers could traverse the terrain to get to war fronts, but they had to carry their supplies. Many armies decided to forage for food; however, foraging restricted movement because it

11058-465: 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

11172-407: The order of attack—France would be attacked first regardless of the diplomatic circumstances. To bypass the fortified Franco-German frontier, the German forces were to be ordered to march through Belgium . Whether or not Russia had committed the first provocation, the German plan agreed to by Emperor William II called for the attack on Russia to take place only after France was defeated. Similarly,

11286-422: The other members of one's company or cause, but because of its military connotations, it conveys a particularly altruistic type of dedicated worker. Traditionally, troops refers to the soldiers in a military. A cavalry soldier of private rank is called a " trooper " in many Commonwealth armies (abbreviated "Tpr", not to be confused with "trouper"). A related sense of the term, troops refers to members of

11400-738: 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

11514-410: The railways to provide rapid movement and concentration of troops, and conscription to provide a trained reserve of soldiers in case of war. The Roman Republic was able to mobilize at various times between 6% (81–83 BCE) to as much as 10% (210s BCE) of the total Roman population, in emergencies and for short periods of time. This included poorly-trained militia . The Confederate States of America

11628-439: The supplies for the French and Piedmontese armies were incredibly slow, and the arms inside these caravans were sloppily organized. These armies were in luck, however, in that their Austrian adversaries experienced similar problems with sluggish supply caravans (one of which apparently covered less than three miles per day). Not only did Prussia take note of the problems in transporting supplies to armies, but it also took note of

11742-469: 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

11856-691: 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

11970-447: The turn of the century, such as potatoes. Despite the advantages of mass armies, mobilizing forces of this magnitude took much more time than it had in the past. The Second Italian War of Independence illustrated all of the problems in modern army mobilization. Prussia began to realize the future of mobilizing mass armies when Napoleon III transported 130,000 soldiers to Italy by military railways in 1859. French caravans that carried

12084-590: 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

12198-601: 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

12312-409: The war. The production of supplies gradually increased throughout the war. In Russia, the expansion of industry allowed a 2,000 percent increase in the production of artillery shells – by November 1915, over 1,512,000 artillery shells were being produced per month. In France, a massive mobilization by the female population to work in factories allowed the rate of shell production to reach 100,000 shells

12426-418: 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

12540-403: 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

12654-749: Was largely left up to the individual Dominions to recruit and equip forces for the war effort. Canadian, Australian and New Zealand mobilizations all involved the creation of new field forces for overseas service rather than using the existing regimental structures as a framework. In the case of Canada, the Militia Minister, Sir Sam Hughes , created the Canadian Expeditionary Force by sending telegrams to 226 separate reserve unit commanders asking for volunteers to muster at Valcartier in Quebec. The field force served separately from

12768-654: 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,

12882-667: 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

12996-781: 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

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