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84-797: Allied victory 1915 1916 1917 1918 Associated articles The Hundred Days Offensive (8 August to 11 November 1918) was a series of massive Allied offensives that ended the First World War . Beginning with the Battle of Amiens (8–12 August) on the Western Front , the Allies pushed the Imperial German Army back, undoing its gains from the German spring offensive (21 March – 18 July). The Germans retreated to

168-764: A British Expeditionary Force of 100,000 men would be landed in France; in addition, the Royal Navy would be responsible for the North Sea , the Channel and protecting Northern France, with the French navy concentrated in the Mediterranean . Britain was committed to support France in a war against Germany but this was not widely understood outside government or the upper ranks of the military. As late as 1 August,

252-648: A German ultimatum demanded unimpeded progress through any part of Belgium, which was refused. Early on the morning of 4 August, the Germans invaded and the Belgian government called for British assistance under the 1839 Treaty; by the end of 1914, over 95% of the country was occupied but the Belgian Army held their lines on the Yser Front throughout the war. Fourth Army (United Kingdom) The Fourth Army

336-492: A clear majority of the Liberal government and its supporters wanted to stay out of the war. While Liberal leaders H. H. Asquith and Edward Grey considered Britain legally and morally committed to support France regardless, waiting until Germany triggered the 1839 Treaty provided the best chance of preserving Liberal party unity. The German high command was aware entering Belgium would lead to British intervention but decided

420-674: A decisive attack in 1919. Through October, the German armies retreated through the territory gained in 1914. The Allies pressed the Germans back toward the lateral railway line from Metz to Bruges , which had supplied the front in northern France and Belgium for much of the war. As the Allied armies reached this line, the Germans were forced to abandon increasingly large amounts of heavy equipment and supplies, further reducing their morale and capacity to resist. The Allied and German armies suffered many casualties. Rearguard actions were fought during

504-642: A number of proposals. Foch agreed to a proposal by Field Marshal Sir Douglas Haig , commander-in-chief of the BEF, to strike on the River Somme , east of Amiens and south-west of the site of the 1916 Battle of the Somme , to force the Germans away from the vital Amiens – Paris railway. The Somme was chosen because it remained the boundary between the BEF and the French armies, along the Amiens–Roye road, allowing

588-548: A route into the crumbling Ottoman Empire, where Germany also had significant interests. Combined with the increase in Russian military strength, both Austria and Germany felt threatened by Serbian expansion; when Austria invaded Serbia on 28 July 1914, Russian Foreign Minister Sergey Sazonov viewed it as an Austro-German conspiracy to end Russian influence in the Balkans. In addition to its own territory, Russia viewed itself as

672-805: The Admiralty that did the same for the Royal Navy . Theatre commanders like Douglas Haig on the Western Front or Edmund Allenby in Palestine then reported to the CIGS. After the Indian Army, the largest individual units were the Australian Corps and Canadian Corps in France, which by 1918 were commanded by their own generals, John Monash and Arthur Currie . Contingents from South Africa, New Zealand and Newfoundland served in theatres including France, Gallipoli , German East Africa and

756-734: The Armistice took effect at 11:00 on 11 November 1918. The last soldier to die was Henry Gunther , one minute before the armistice came into effect. Allies of World War I Associated allies and co-belligerents: The Allies , the Entente or the Triple Entente was an international military coalition of countries led by France , the United Kingdom , Russia , the United States , Italy , and Japan against

840-686: The Balkan League to prevent further Austrian expansion. Austria viewed Serbia with hostility partly due to its links with Russia, whose claim to be the protector of South Slavs extended to those within the Austro-Hungarian Empire, such as the Czechs and Slovaks . Serbia also potentially gave Russia the ability to achieve their long-held objective of capturing Constantinople and the Dardanelles . Austria-Hungary supported

924-745: The Battle of Amiens ), with artillery brought forward and munitions replenished, the Fourth Army also resumed its advance, with the Australian Corps crossing the Somme River on the night of 31 August, breaking the German lines during the Battle of Mont Saint-Quentin . On 26 August, to the north of the Somme, the First Army widened the attack by another 7 mi (11 km) with the Second Battle of Arras of 1918, which includes

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1008-663: The Battle of St Quentin Canal and the French First Army attacking fortifications outside St Quentin. By 5 October, the Allies had broken through the entire depth of the Hindenburg defences over a 19 mi (31 km) front. General Rawlinson wrote, "Had the Boche [Germans] not shown marked signs of deterioration during the past month, I should never have contemplated attacking the Hindenburg line. Had it been defended by

1092-717: The Battle of the Scarpe (1918) (26 August) and the Battle of Drocourt-Queant Line (2 September). South of the BEF, the French First Army approached the Hindenburg Line on the outskirts of St. Quentin during the Battle of Savy-Dallon (10 September), and the French Tenth Army approached the Hindenburg Line near Laon during the Battle of Vauxaillon (14 September). The British Fourth Army approached

1176-663: The British Empire , many of whom made significant contributions to the Allied war effort, both in the provision of troops and civilian labourers. It was split into Crown Colonies administered by the Colonial Office in London, such as Nigeria , and the self-governing Dominions of Canada , Newfoundland , New Zealand , Australia and South Africa . These controlled their own domestic policies and military expenditure but not foreign policy. In terms of population,

1260-991: The British Indian Army served in different theatres of the war, primarily France and the Middle East . From 1914 to 1916, overall Imperial diplomatic, political and military strategy was controlled by the British War Cabinet in London; in 1917 it was superseded by the Imperial War Cabinet , which included representatives from the Dominions. Under the War Cabinet were the Chief of the Imperial General Staff or CIGS , responsible for all Imperial ground forces, and

1344-777: The Central Powers of Germany , Austria-Hungary , the Ottoman Empire , and Bulgaria in World War I (1914–1918). By the end of the first decade of the 20th century, the major European powers were divided between the Triple Entente and the Triple Alliance . The Triple Entente was made up of the United Kingdom, France, and Russia. The Triple Alliance was originally composed of Germany, Austria–Hungary, and Italy, but Italy remained neutral in 1914. As

1428-685: The Fifth Army during the German offensive known as Operation Michael . The Fourth Army spearheaded the British Hundred Days offensive that began with the Battle of Amiens and ended with the Armistice in November, 1918. On the first day of the Somme the Fourth Army comprised: When reformed for the Battle of Amiens: In September 1918 the Army was the only British force reinforced with substantial American (AEF) forces: In

1512-724: The French Sixth Army ), attacked near Ypres in Flanders (the Fifth Battle of Ypres ). Both attacks made good progress initially but were then slowed by supply difficulties. The Grand Offensive involved attacking over difficult terrain, resulting in the Hindenburg Line not being broken until 17 October. On 29 September, the central attack on the Hindenburg Line commenced, with the British Fourth Army (with British, Australian and American forces) attacking in

1596-484: The Hindenburg Line , but the Allies broke through the line with a series of victories, starting with the Battle of St Quentin Canal on 29 September. The offensive led directly to the Armistice of 11 November 1918 which ended the war with an Allied victory. The term "Hundred Days Offensive" does not refer to a battle or strategy, but rather the rapid series of Allied victories. The German spring offensive on

1680-683: The League of the Three Emperors , then with Germany in the 1887–1890 Reinsurance Treaty ; both collapsed due to the competing interests of Austria and Russia in the Balkans . While France took advantage of this to agree the 1894 Franco-Russian Alliance , Britain viewed Russia with deep suspicion; in 1800, over 3,000 kilometres separated the Russian Empire and British India, by 1902, it was 30 km in some areas. This threatened to bring

1764-686: The Mariana , Caroline , and Marshall Islands , while in 1917, a Japanese naval squadron was sent to support the Allies in the Mediterranean Sea . Japan's primary interest was in China and in January 1915, the Chinese government was presented with a secret ultimatum of Twenty-One Demands , demanding extensive economic and political concessions. While these were eventually modified, the result

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1848-674: The Paris Peace Conference recognized the United Kingdom, France, Italy, Japan, and the United States as "the Principal Allied and Associated Powers". When the war began in 1914, the Central Powers were opposed by the Triple Entente , formed in 1907 when the agreement between the United Kingdom and Russia complemented existing agreements between the three powers. Fighting commenced when Austria invaded Serbia on 28 July 1914, purportedly in response to

1932-891: The Pursuit to the Selle (9 October), battles of Courtrai (14 October), Mont-d'Origny (15 October), the Selle (17 October), Lys and Escaut (20 October) (including the subsidiary battles of the Lys and of the Escaut), the Serre (20 October), Valenciennes (1 November), the Sambre (including the Second Battle of Guise) (4 November), and Thiérache (4 November), and the Passage of the Grande Honnelle (5 November), with fighting continuing until

2016-608: The Second World War , no Fourth Army took the field but as part of the deception plans Operation Cockade and the later Operation Fortitude North, the Germans were encouraged to believe that a Fourth Army had been established with its headquarters in Edinburgh Castle and was preparing to invade Norway . The selection of the inactive Fourth Army was likely very deliberate because of its combat history during

2100-402: The Treaty of Brest-Litovsk on 3 March 1918. Romania was forced to do the same in the May 1918 Treaty of Bucharest but on 10 November, it repudiated the Treaty and once more declared war on the Central Powers. These changes meant the Allies who negotiated the Treaty of Versailles in 1919 included the United Kingdom, France, Italy, Japan and the United States; Part One of the Treaty agreed to

2184-402: The Western Front had begun on 21 March 1918 with Operation Michael and had petered out by July. The German Army had advanced to the River Marne , but failed to achieve their aim of a victory that would decide the war. When the German Operation Marne-Rheims ended in July, the Allied supreme commander, Ferdinand Foch , ordered a counter-offensive, which became known as the Second Battle of

2268-459: The Yser Front throughout the war. This allowed Belgium to be treated as an Ally, in contrast to Luxembourg which retained control over domestic affairs but was occupied by the German military . In the East, between 7 and 9 August the Russians entered German East Prussia on 7 August, Austrian Eastern Galicia . Japan joined the Entente by declaring war on Germany on 23 August, then Austria on 25 August. On 2 September, Japanese forces surrounded

2352-402: The assassination of Archduke Franz Ferdinand , heir to Emperor Franz Joseph I ; this brought Serbia's ally Montenegro into the war on 8 August and it attacked the Austrian naval base at Cattaro , modern Kotor. At the same time, German troops carried out the Schlieffen Plan , entering neutral Belgium and Luxembourg ; over 95% of Belgium was occupied but the Belgian Army held their lines on

2436-401: The 19th century, Britain sought to maintain the European balance of power without formal alliances, a policy known as splendid isolation . This left it dangerously exposed as Europe divided into opposing power blocs and the 1895–1905 Conservative government negotiated first the 1902 Anglo-Japanese Alliance , then the 1904 Entente Cordiale with France. The first tangible result of this shift

2520-401: The Allied armies with its extensive resources. Pershing was keen to use his army as an independent force. The British Expeditionary Force (BEF) had been reinforced by large numbers of troops returned from the Sinai and Palestine campaign and from the Italian front , and by replacements previously held back in Britain by Prime Minister David Lloyd George . The military planners considered

2604-434: The Allies had suffered about 6,500 killed, wounded and missing. The collapse in German morale led Erich Ludendorff to dub it "the Black Day of the German Army". The advance continued for three more days but without the spectacular results of 8 August, since the rapid advance outran the supporting artillery and ran short of supplies. During those three days, the Allies had managed to gain 12 mi (19 km). Most of this

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2688-417: The Battle of Épehy and the Battle of the Canal du Nord on 27 September. The first attack of the Grand Offensive was launched on 26 September by the French and the AEF in the Meuse-Argonne Offensive (this offensive includes the battles of Somme-Py, Saint-Thierry, Montfaucon, and Chesne of 1 November). On 28 September, the Army Group under Albert I of Belgium (the Belgian Army, the British Second Army and

2772-427: The British army and Royal Navy were committed to support France in the event of war with Germany but even in the British government, very few were aware of the extent of these commitments. In response to Germany's declaration of war on Russia, France issued a general mobilisation in expectation of war on 2 August and on 3 August, Germany also declared war on France. Germany's ultimatum to Belgium brought Britain into

2856-523: The East. The growth of the Russian railway network and increase in speed of mobilisation made rapid victory over France even more important; to accommodate the additional 170,000 troops approved by the 1913 Army Bill, the 'incursion' now became a full-scale invasion. The Germans accepted the risk of British intervention; in common with most of Europe, they expected it to be a short war while their London Ambassador claimed civil war in Ireland would prevent Britain from assisting its Entente partners. On 3 August,

2940-556: The Entente in return for German territories in the Pacific, greatly annoying the Australian government which also wanted them. On 7 August 1914, Britain officially asked for assistance in destroying German naval units in China and Japan formally declared war on Germany on 23 August 1914, followed by Austria-Hungary on 25 August 1914. On 2 September 1914, Japanese forces surrounded the German Treaty Port of Qingdao , then known as Tsingtao, which surrendered on 7 November. The Imperial Japanese Navy simultaneously occupied German colonies in

3024-445: The First World War. That diverted and kept German units away from the real invasion zone in Normandy . In the subsequent Operation Fortitude South , the Fourth Army, with different units, was presented as part of the fictitious First United States Army Group (FUSAG) in its threat to the Pas-de-Calais . After Operation Market Garden , the Fourth Army was notionally intended to conduct Operation Trolleybar , an amphibious assault upon

3108-399: The French and German militaries accepted Germany would almost certainly violate Belgian neutrality in the event of war, the extent of that was unclear. The original Schlieffen Plan only required a limited incursion into the Belgian Ardennes , rather than a full-scale invasion; in September 1911, the Belgian Foreign Minister told a British Embassy official they would not call for assistance if

3192-424: The French lost nearly 300,000 dead on the Western Front, more than Britain suffered in the whole of WWII and the gaps were partly filled by colonial troops, over 500,000 of whom served on the Western Front over the period 1914–1918. Colonial troops also fought at Gallipoli , occupied Togo and Kamerun in West Africa and had a minor role in the Middle East, where France was the traditional protector of Christians in

3276-404: The German Treaty Port of Tsingtao (now Qingdao) in China and occupied German colonies in the Pacific, including the Mariana , Caroline , and Marshall Islands . Despite its membership of the Triple Alliance , Italy remained neutral until 23 May 1915 when it joined the Entente, declaring war on Austria but not Germany. On 17 January 1916, Montenegro capitulated and left the Entente; this

3360-452: The Germans limited themselves to that. While neither Britain or France could allow Germany to occupy Belgium unopposed, a Belgian refusal to ask for help would complicate matters for the British Liberal government , which contained a significant isolationist element. However, the key German objective was to avoid war on two fronts; France had to be defeated before Russia could fully mobilise and give time for German forces to be transferred to

3444-490: The Germans of two years ago, it would certainly have been impregnable…." On 8 October, the First and Third British Armies broke through the Hindenburg Line at the Second Battle of Cambrai . This collapse forced the German High Command to accept that the war had to be ended. The evidence of failing German morale also convinced many Allied commanders and political leaders that the war could be ended in 1918; previously, all efforts had been concentrated on building up forces to mount

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3528-453: The Hindenburg Line along the St Quentin Canal, during the Battle of Épehy (18 September). By 2 September, the Germans had been forced back close to the Hindenburg Line from which they had launched their offensive in the spring. Foch planned a series of concentric attacks on the German lines in France (sometimes referred to as the Grand Offensive), with the various axes of advance designed to cut German lateral communications , intending that

3612-419: The Italian Army , died on 1 July 1914, taking many of the prospects for Italian support with him. The Italian Prime Minister Antonio Salandra argued that as the Alliance was defensive in nature, Austria's aggression against Serbia and Italy's exclusion from the decision-making process meant it was not obliged to join them. His caution was understandable because France and Britain either supplied or controlled

3696-452: The Marne . The Germans, recognizing their untenable position, withdrew from the Marne to the north. For this victory, Foch was granted the title Marshal of France . After the Germans had lost their forward momentum, Foch considered the time had arrived for the Allies to return to the offensive . The American Expeditionary Force (AEF) under United States General John J. Pershing had arrived in France in large numbers and had reinvigorated

3780-422: The Middle East. Australian troops separately occupied German New Guinea , with the South Africans doing the same in German South West Africa ; this resulted in the Maritz rebellion by former Boers, which was quickly suppressed. After the war, New Guinea and South-West Africa became Protectorates , held until 1975 and 1990 respectively. Between 1873 and 1887, Russia was allied with Germany and Austria-Hungary in

3864-423: The Ottoman Empire, the centrepiece being the planned Berlin–Baghdad railway , with Serbia the only section not controlled by a pro-German state. The exact role played by Serbian officials in the assassination of Archduke Franz Ferdinand is still debated but despite complying with most of their demands, Austria-Hungary invaded on 28 July 1914. While Serbia successfully repulsed the Austro-Hungarian army in 1914, it

3948-437: The Ottoman provinces of Syria , Palestine and Lebanon . Prior to the Meiji Restoration in 1868, Japan was a semi-feudal, largely agrarian state with few natural resources and limited technology. By 1914, it had transformed itself into a modern industrial state, with a powerful military; by defeating China in the First Sino-Japanese War during 1894–1895, it established itself as the primary power in East Asia and colonised

4032-416: The Passchendaele–Westroosebeke ridge and an advance begun on Roeselare and Torhout , the XV Corps would mount the coastal operation. As the Ypres fighting became bogged down, the Fourth Army divisions were drawn off as reinforcements until the army was effectively disbanded. The Fourth Army was reformed in early 1918—once again under Rawlinson—following the virtual destruction and subsequent disbanding of

4116-400: The Triple Entente with France, which at this stage was largely informal. In 1908, Austria annexed the former Ottoman province of Bosnia and Herzegovina ; Russia responded by creating the Balkan League in order to prevent further Austrian expansion. In the 1912–1913 First Balkan War , Serbia , Bulgaria and Greece captured most of the remaining Ottoman possessions in Europe; disputes over

4200-577: The actual results of the 1919 Treaty of Versailles would be powerful factors in the rise of Benito Mussolini . In 1817, the Principality of Serbia became an autonomous province within the Ottoman Empire ; with Russian support, it gained full independence after the 1877–1878 Russo-Turkish War . Many Serbs viewed Russia as protector of the South Slavs in general but also specifically against Bulgaria, where Russian objectives increasingly collided with Bulgarian nationalism . When Austria annexed Bosnia and Herzegovina in 1908, Russia responded by creating

4284-664: The countries that fought for the Allies were also part of the Entente powers such as American Philippines , Belgian Congo , British India , French Algeria , and Japanese Korea . The United States joined near the end of the war in 1917 (the same year in which Russia withdrew from the conflict) as an "associated power" rather than an official ally. Other "associated members" included Serbia , Belgium , Montenegro , Asir , Nejd and Hasa , Portugal , Romania , Hejaz , Panama , Cuba , Greece , China , Siam , Brazil , Armenia , Luxembourg , Guatemala , Nicaragua , Costa Rica , Haiti , Liberia , and Honduras . The treaties signed at

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4368-416: The defender of its fellow Slavs and on 30 July, mobilized in support of Serbia. In response, Germany declared war on Russia on 1 August, followed by Austria-Hungary on 6th; after Ottoman warships bombarded Odesa in late October, the Entente declared war on the Ottoman Empire in November 1914. French defeat in the 1870–1871 Franco-Prussian War led to the loss of the two provinces of Alsace-Lorraine and

4452-451: The division of these resulted in the Second Balkan War , in which Bulgaria was comprehensively defeated by its former allies. Russia's industrial base and railway network had significantly improved since 1905, although from a relatively low base; in 1913, Tsar Nicholas approved an increase in the Russian Army of over 500,000 men. Although there was no formal alliance between Russia and Serbia, their close bilateral links provided Russia with

4536-404: The entire population. In 1830, the southern provinces of the Netherlands broke away to form the Kingdom of Belgium and their independence was confirmed by the 1839 Treaty of London . Article VII of the Treaty required Belgium to remain perpetually neutral and committed Austria, France, Germany and Russia to guarantee that against aggression by any other state, including the signatories. While

4620-414: The establishment of the League of Nations on 25 January 1919. This came into being on 16 January 1920 with Britain, France, Italy and Japan as permanent members of the Executive Council; the US Senate voted against ratification of the treaty on 19 March, thus preventing the United States from joining the League. For similar statistics of the Central Powers, see Central_Powers#Statistics . For much of

4704-409: The establishment of the Third Republic . The suppression of the Paris Commune by the new regime caused deep political divisions and led to a series of bitter political struggles, such as the Dreyfus affair . As a result, aggressive nationalism or Revanchism was one of the few areas to unite the French. The loss of Alsace-Lorraine deprived France of its natural defence line on the Rhine , while it

4788-530: The expansion of its railway network, particularly in border areas with Germany and Austria-Hungary. However, Russian defeat in the 1904–1905 Russo-Japanese War damaged its credibility, while Britain's isolation during the Second Boer War meant both countries sought additional allies. This resulted in the 1904 Entente Cordiale with Britain; like the 1907 Anglo-Russian Convention , for domestic British consumption it focused on settling colonial disputes but led to informal co-operation in other areas. By 1914, both

4872-422: The idea of an independent Albania , since this would prevent Serbian access to the Austrian-controlled Adriatic Sea . The success of the Albanian revolt in 1912 threatened Serbian ambitions for the incorporation of " Old Serbia " into its domain and exposed the weakness of the Ottoman Empire. This led to the outbreak of the First Balkan War , with Serbia , Montenegro , Bulgaria and Greece capturing most of

4956-446: The import of most of Italy's raw materials, including 90% of its coal. Salandra described the process of choosing a side as 'sacred egoism,' but as the war was expected to end before mid-1915 at the latest, making this decision became increasingly urgent. In line with Italy's obligations under the Triple Alliance, the bulk of the army was concentrated on Italy's border with France; in October, Pollio's replacement, General Luigi Cadorna ,

5040-433: The largest component (after Britain herself) was the British Raj or British India, which included modern India , Pakistan , Myanmar and Bangladesh . Unlike other colonies which came under the Colonial Office , it was governed directly by the India Office or by princes loyal to the British; it also controlled British interests in the Persian Gulf , such as the Trucial States and Oman . Over one million soldiers of

5124-494: The plan was the Australian Lieutenant General John Monash . Through careful preparation, the Allies achieved surprise. The attack, led by the British Fourth Army , broke through the German lines, and tanks attacked German rear positions, sowing panic and confusion. By the end of the day, a gap 15 mi (24 km) wide had been created in the German line south of the Somme. The Allies had taken 17,000 prisoners and 339 guns. Total German losses were estimated to be 30,000 men, while

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5208-406: The reassurance needed to take on Russia in the 1905 Russo-Japanese War ; victory established Japan in the Chinese province of Manchuria . With Japan as an ally in the Far East, John Fisher , First Sea Lord from 1904 to 1910, was able to refocus British naval resources in the North Sea to counter the threat from the Imperial German Navy . The Alliance was renewed in 1911; in 1914, Japan joined

5292-448: The remaining Ottoman possessions in Europe. Disputes over the division of these resulted in the Second Balkan War , in which Bulgaria was comprehensively defeated by its former allies. As a result of the 1913 Treaty of Bucharest , Serbia increased its territory by 100% and its population by 64%. However, it now faced a hostile Austria-Hungary, a resentful Bulgaria and resistance in its conquered territories . Germany too had ambitions in

5376-403: The risk was acceptable; they expected a short war while their ambassador in London claimed troubles in Ireland would prevent Britain from assisting France. On 3 August, Germany demanded unimpeded progress through any part of Belgium and when this was refused, invaded early on the morning of 4 August. This changed the situation; the invasion of Belgium consolidated political and public support for

5460-409: The sector. Haig refused and prepared to launch a fresh offensive by the Third Army at Albert (the Battle of Albert ), which opened on 21 August. The offensive was a success, pushing the German 2nd Army back over a 34 mi (55 km) front. Albert was captured on 22 August. The attack was widened on the south, by the French Tenth Army starting the Second Battle of Noyon on 17 August, capturing

5544-400: The success of an attack would enable the entire front line to be advanced. The main German defences were anchored on the Hindenburg Line, a series of defensive fortifications stretching from Cerny on the Aisne river to Arras . Before Foch's main offensive was launched, the remaining German salients west and east of the line were crushed at Havrincourt and St Mihiel on 12 September and at

5628-519: The then-unified Korea and Formosa, now modern Taiwan . Concerned by Russian expansion in Korea and Manchuria , Britain and Japan signed the Anglo-Japanese Alliance on 30 January 1902, agreeing if either were attacked by a third party, the other would remain neutral and if attacked by two or more opponents, the other would come to its aid. This meant Japan could rely on British support in a war with Russia, if either France or Germany, which also had interests in China, decided to join them. This gave Japan

5712-408: The town of Noyon on 29 August. On 26 August, to the north of the initial attack, the First Army widened the attack by another 7 mi (11 km) with the Second Battle of Arras of 1918. Bapaume fell on 29 August (during the Second Battle of Bapaume ). With the front line broken, a number of battles took place as the Allies forced the Germans back to the Hindenburg Line. East of Amiens (after

5796-582: The two armies to cooperate. The Picardy terrain provided a good surface for tanks , unlike in Flanders , and the defences of the German 2nd Army under General Georg von der Marwitz were relatively weak, having been subjected to continual raiding by the Australians in a process termed peaceful penetration . The Battle of Amiens (with the French attack on the southern flank called the Battle of Montdidier) opened on 8 August, with an attack by more than 10 Allied divisions—Australian, Canadian, British and French forces—with more than 500 tanks. The mastermind of

5880-412: The two into direct conflict, as did the long-held Russian objective of gaining control of the Bosporus Straits and with it access to the British-dominated Mediterranean Sea . Defeat in the 1905 Russo-Japanese War and Britain's isolation during the 1899–1902 Second Boer War led both parties to seek allies. The Anglo-Russian Convention of 1907 settled disputes in Asia and allowed the establishment of

5964-556: The war by presenting what appeared to be a simple moral and strategic choice. The Belgians asked for assistance under the 1839 Treaty and in response, Britain declared war on Germany on 4 August 1914. Although Germany's violation of Belgium neutrality was not the only cause of British entry into the war, it was used extensively in government propaganda at home and abroad to make the case for British intervention. This confusion arguably persists today. The declaration of war automatically involved all dominions and colonies and protectorates of

6048-432: The war on 4 August, although France did not declare war on Austria-Hungary until 12 August. As with Britain, France's colonies also became part of the war; pre-1914, French soldiers and politicians advocated using French African recruits to help compensate for France's demographic weakness. But it eventually proved useless, the soldiers from Metropolitan France still undertook all the tasks. From August to December 1914,

6132-631: The war progressed, each coalition added new members. Japan joined the Entente in 1914 and, despite proclaiming its neutrality at the beginning of the war, Italy also joined the Entente in 1915. The term "Allies" became more widely used than "Entente" , although the United Kingdom, France, Russia, and Italy were also referred to as the Quadruple Entente and, together with Japan, as the Quintuple Entente . The colonies administered by

6216-582: Was British support for France against Germany in the 1905 Moroccan Crisis . The 1905–1915 Liberal government continued this re-alignment with the 1907 Anglo-Russian Convention . Like the Anglo-Japanese and Entente agreements, it focused on settling colonial disputes but by doing so paved the way for wider co-operation and allowed Britain to refocus resources in response to German naval expansion . Since control of Belgium allowed an opponent to threaten invasion or blockade British trade, preventing it

6300-577: Was a long-standing British strategic interest. Under Article VII of the 1839 Treaty of London , Britain guaranteed Belgian neutrality against aggression by any other state, by force if required. Chancellor Theobald von Bethmann Hollweg later dismissed this as a 'scrap of paper,' but British law officers routinely confirmed it as a binding legal obligation and its importance was well understood by Germany. The 1911 Agadir Crisis led to secret discussions between France and Britain in case of war with Germany. These agreed that within two weeks of its outbreak,

6384-563: Was a surge of anti-Japanese nationalism in China and an economic boycott of Japanese goods. In addition, the other Allies now saw Japan as a threat, rather than a partner, lead to tensions first with Russia, then the US after it entered the war in April 1917. Despite protests from the other Allies, after the war Japan refused to return Qingdao and the province of Shandong to China. The 1882 Triple Alliance between Germany, Austria-Hungary and Italy

6468-520: Was completely defeated on the northern sector, so subsequent Fourth Army operations concentrated on the southern sector, handing control of the northern sector to the Reserve Army . The plan for the Fourth Army during the Third Battle of Ypres (31 July – 10 November 1917), was to mount Operation Hush , an amphibious invasion of the Belgian coast. Once the Germans had been pushed back from

6552-526: Was exhausted by the two Balkan Wars and unable to replace its losses of men and equipment. In 1915, Bulgaria joined the Central Powers and by the end of the year, a combined Bulgar-Austrian-German army occupied most of Serbia. Between 1914 and 1918, Serbia suffered the greatest proportional losses of any combatant, with over 25% of all those mobilised becoming casualties; including civilians and deaths from disease, over 1.2 million died, nearly 30% of

6636-533: Was formed in France on 5 February 1916, under the command of Sir Henry Rawlinson . It was created in preparation for the Battle of the Somme after the French Tenth Army was transferred to the Battle of Verdun . On the first day on the Somme , eleven Fourth Army divisions (from XIII Corps , XV Corps , III Corps , X Corps and VIII Corps ) attacked astride the Albert–Bapaume road. The attack

6720-464: Was offset when Germany declared war on Portugal in March 1916, while Romania commenced hostilities against Austria on 27 August. On 6 April 1917, the United States entered the war as a co-belligerent, along with the associated allies of Liberia , Siam and Greece . After the 1917 October Revolution , Russia left the Entente and agreed to a separate peace with the Central Powers with the signing of

6804-532: Was ordered to begin moving these troops to the North-Eastern one with Austria. Under the April 1915 Treaty of London , Italy agreed to join the Entente in return for Italian-populated territories of Austria-Hungary and other concessions; in return, it declared war on Austria-Hungary in May 1915 as required, although not on Germany until 1916. Italian resentment at the difference between the promises of 1915 and

6888-537: Was renewed at regular intervals, but was compromised by conflicting objectives between Italy and Austria in the Adriatic and Aegean seas. Italian nationalists referred to Austrian-held Istria (including Trieste and Fiume ) and Trento as 'the lost territories' , making the Alliance so controversial that the terms were kept secret until it expired in 1915. Alberto Pollio , the pro-Austrian Chief of Staff of

6972-519: Was taken on the first day as the arrival of German reinforcements after this slowed the Allied advance. On 10 August, the Germans began to pull out of the salient that they had managed to occupy during Operation Michael in March, back towards the Hindenburg Line . On 15 August, Foch demanded that Haig continue the Amiens offensive, even though the attack was faltering as the troops outran their supplies and artillery and German reserves were being moved to

7056-546: Was weaker demographically than Germany, whose 1911 population was 64.9 million to 39.6 in France, which had the lowest birthrate in Europe. This meant that despite their very different political systems, when Germany allowed the Reinsurance Treaty to lapse, France seized the opportunity to agree the 1894 Franco-Russian Alliance . It also replaced Germany as the primary source of financing for Russian industry and

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