First World War

Clockwise from top: Trenches in frontline, a British Mark I Tank crossing a trench, the Royal Navy battleship HMS Irresistible sinking after striking a mine at the battle of the Dardanelles, a Vickers machine gun crew with gas masks and a Sopwith Camel biplane.

World War I, also known as the First World War, the Great War, the War of the Nations and the War to End All Wars, was a world conflict lasting from 1914 to 1919, with the fighting lasting until 1918. The label World War I or First World War did not come into general use until after the outbreak of World War II in 1939, and until then it was known as the Great War or the World War. The war was fought by the Allied Powers on one side, and the Central Powers on the other. No previous conflict had mobilized so many soldiers or involved so many in the field of battle. By its end, the war had become the bloodiest war in recorded history.

World War I became infamous for trench warfare along the Western Front. The trenches went from the North Sea to the border of Switzerland. More than 9 million died on the war's battlefields, and nearly that many more on the home fronts because of food shortages and genocide committed under the cover of various civil wars and internal conflicts (e.g. the Armenian genocide). In World War I about 5% of the casualties (directly caused by the war) were civilian - in World War II, this figure was 50%.

World War I proved to be the decisive break with the old world order. Four empires were shattered: the German, the Austro-Hungarian, the Ottoman, and the Russian. Their four dynasties, the Hohenzollerns, the Habsburgs, the Ottomans, and the Romanovs, who had roots of power back to the days of the Crusades, all fell during the war. The French Empire survived with little change; the British Empire saw the semi-independence of Canada, Australia, South Africa and New Zealand.

Some historians have argued that upheaval of war led to the rise of Communism in Russia, , Fascism in Italy, and Nazism in Germany. In the east, the demise of the Ottoman Empire paved the way for a modern democratic successor state, Turkey. In Central Europe, new states such as Czechoslovakia, Finland, Latvia, Lithuania, Estonia and Yugoslavia were born and Austria, Hungary and Poland were re-created.

Causes

Gavrilo Princip - the assassin of Franz Ferdinand. The murder was the igniting torch of World War I.

See also: Causes of World War I and Participants in World War I

On June 28, 1914, Franz Ferdinand, Archduke of Austria and heir to the Austro-Hungarian throne, was assassinated in Sarajevo by Gavrilo Princip, a Bosnian Serb student. He was part of a group of fifteen assassins, acting with support from the Black Hand, a secret society founded by pan-Serbian nationalists, with links to the Serbian military. The assassination sparked little initial concern in Europe. The Archduke himself was not popular, least of all in the Austro-Hungarian Empire. While there were riots in Sarajevo following the Archduke's death, these were largely aimed at the Serbian minority. Though this assassination has been linked as the direct trigger for World War I, the war's real origins lie further back, in the complex web of alliances and counterbalances that developed between the various European powers after the defeat of France and formation of the German state under the leadership of Otto von Bismarck in 1871.

Reasons & Responsibilities

The reasons for the outbreak of World War I are a complicated issue; there are many factors which intertwine. Some examples are:

• Fervent and uncompromising nationalism
• Unresolved previous disputes
• The intricate system of alliances
• Convoluted and fragmented governance
• Delays and misunderstandings in diplomatic communications
• The arms races of the previous decades.
• Rigidity in military planning
• See also: Causes of World War I

There are many different hypotheses that try to explain who, or what, is to blame for the outbreak of the First World War. Early explanations, prominent in the 1920s and 1930s, stressed the official version of responsibility as described in the Treaty of Versailles and Treaty of Trianon, that Germany and its allies were solely responsible for the war. The official version was a hypothesis based on the idea that the war begun when Austria-Hungary invaded Serbia, backed by Germany, and that Germany later invaded Belgium and Luxembourg without provocation. The hypothesis is that responsibility for the war lies with Germany and Austro-Hugary for their aggression, and that Russia, France and Britain were reacting legitimately against this aggression. This idea was later backed by academics such as Franz Fischer, Imanuel Geiss, Hans-Ulrich Wehler, Wolfgang Mommsen, and V.R. Berghahn. As time progressed, scholars looked at other factors, such as the rigidity of both German and Russian military planning, each of which stressed the importance of striking first and executing plans quickly.

Some observers have suggested that for many decades the British had been accustomed to colonial wars which were won relatively easily against much weaker adversaries, and that this helped build enthusiasm for the Great War. However, the difficulties encountered in the Boer War (1899-1902) make it unlikely that the British were naive as to the potential cost of a major war. The fact that no major political force opposed the war meant that those who did not agree with it had little organisational power to build opposition, though small protests continued throughout the war.

Another cause of the war was the building of alliances and arms races. An example of the latter is the launch of HMS Dreadnought, a revolutionary battleship that rendered all previous ships obsolete as "pre-dreadnoughts", in 1906. This weakened Britain's power as a seafaring nation and sparked a major naval arms race in shipbuilding, particularly between Britain and Germany due to new imperialism. Overall, nations in the Triple Entente became fearful of the Triple Alliance and vice versa.

The civilian leaders of the European powers also found themselves facing a wave of nationalist zeal that had been building across Europe for years. This left governments with ever fewer options and little room to manoeuvre as the last weeks of July 1914 slipped away. Frantic diplomatic efforts to mediate the Austrian-Serbian quarrel simply became irrelevant, as the automatic military escalations between Germany and Russia reinforced one another.

Furthermore, the problem of communications in 1914 should not be underestimated; all nations still used telegraphy and ambassadors as the main form of communication, resulting in delays from hours to even days.

There is probably no single concise or conclusive assessment of the exact cause of the First World War.

Opening battles

Haut-Rhin, France 1917. A complete set of these images can be found at World War One Color Photos

Some of the very first actions of the war occurred far from Europe, in Africa and in the Pacific Ocean. The first British Empire soldier killed in the war was John Parr, on August 21, 1914. On August 8 1914 a combined French and British Empire force invaded the German protectorate of Togoland. On August 10 German forces based in South-West Africa attacked South Africa. New Zealand occupied German Samoa (30 August 1914) and on September 11 the Australian Naval and Military Expeditionary Force landed on the island of Neu Pommern, which formed part of German New Guinea. Within a few months the Entente forces had accepted the surrender of or driven out German forces in the Pacific. Sporadic and fierce fighting continued in Africa for the remainder of the war.

In Europe, Germany and Austria-Hungary suffered from miscommunication regarding each army's intentions. Germany had originally guaranteed to support Austria-Hungary's invasion of Serbia, but the interpretations of this idea differed. Austro-Hungarian leaders thought Germany would cover her northern flank against Russia, but Germany had planned for Austria-Hungary to focus the majority of its troops on Russia while Germany dealt with France on the Western Front. This confusion forced the Austro-Hungarian army to split its troop concentrations from the south in order to meet the Russians in the north. The Serb army, coming up from the south of the country, met the Austrian army at the Battle of Cer on 12 August 1914.

The Serbians occupied defensive positions against the Austrians. The first attack came on August 16th, between parts of the 21st Austro–Hungarian division and parts of the Serbian Combined division. In harsh night-time fighting the battle ebbed and flowed, until Stepa Stepanovic rallied the Serbian line. Three days later the Austrians retreated across the Danube, having suffered 21,000 casualties as against 16,000 Serbian. This marked the first major Allied victory of the war. The Austrians had not achieved their main goal of eliminating Serbia, and it became increasingly likely that Germany would have to maintain forces on two fronts.

Germany's plan (named the Schlieffen plan) to deal with the Franco-Russian alliance involved delivering a knock-out blow to the French and then turning to deal with the more slowly mobilized Russian army. Rather than invading eastern France directly, German planners deemed it prudent to attack France from the north. To do so, the German army had to march through Belgium. Germany demanded free passage from the Belgian government, promising to treat Belgium as Germany's firm ally if the Belgians agreed. When Belgium refused, Germany invaded and began marching through Belgium anyway, after first invading and securing Luxembourg. It soon encountered resistance before the forts of the Belgian city of Liège, although the army as a whole continued to make rapid progress into France. Britain sent an army to France (the British Expeditionary Force, or BEF), which advanced into Belgium. Initially the Germans had great successes in the Battle of the Frontiers (14–24 August 1914).

However, the delays brought about by the resistance of the Belgian, French and British forces; the unexpectedly rapid mobilization of the Russians; and the overly-ambitious objectives upset the German plans. Russia attacked in East Prussia, diverting German forces intended for the Western Front. Germany defeated Russia in a series of battles collectively known as the Second Battle of Tannenberg (17 August – 2 September). This diversion exacerbated problems of insufficient speed of advance from railheads, not allowed for by the German General Staff, and allowed French and British forces to finally halt the German advance on Paris at the First Battle of the Marne (September 1914) as the Entente forced the Central Powers into fighting a war on two fronts. The German army had fought its way into a good defensive position inside France and had permanently incapacitated 230,000 more French and British troops than it had lost itself in the months of August and September. Yet staff incompetence and leadership timidity, as Ludendorff had needlessly transferred troops from the right to protect Sedan, cost Germany the chance for an early knockout.

Early stages: from romanticism to the trenches

In the trenches: Infantry with gasmasks, Ypres, 1917

The perception of war in 1914 was romanticized by many people, and its declaration was met with great enthusiasm by these people. The common view was that it would be a short war of manoeuvre with a few sharp actions (to "teach the enemy a lesson") and would end with a victorious entry into the enemy capital, then home for a victory parade or two and back to "normal" life. However, many people regarded the coming war with great pessimism and worry. Many military figures, such as Lord Kitchener and Erich Ludendorff, predicted the war would be a long one. Other political leaders, such as Bethmann Hollweg in Germany, were concerned by the potential social consequences of a war. International bond and financial markets entered severe crises in late July and early August reflecting worry about the financial consequences of war.

The perceived excitement of war captured the imagination of many in the warring nations. Spurred on by propaganda and nationalist fervor, many eagerly joined the ranks in search of adventure. Few were prepared for what they actually encountered at the front.

See also: Recruitment to the British Army during WW I

Trench warfare begins

Main article: Western Front (World War I)

Advances in military technology meant that defensive firepower out-weighed offensive capabilities, making the war particularly murderous, as tactics had failed to keep up. Barbed wire was a significant hindrance to massed infantry advances; artillery, now vastly more lethal than in the 1870s, coupled with machineguns, made crossing open ground a nightmarish prospect. General Staffs of European armies had uniformly ignored the lessons of the U.S. Civil War and were often indifferent to massive loss of life (General Haig's diaries are particularly striking in this respect).

After their initial success on the Marne, Entente and German forces began a series of outflanking manoeuvres to try to force the other to retreat, in the so-called Race to the Sea. Britain and France soon found themselves facing entrenched German positions from Lorraine to Belgium's Flemish coast. Britain and France sought to take the offensive while Germany defended occupied territories. One consequence was that German trenches were much better constructed than those of their enemy: Anglo-French trenches were only intended to be 'temporary' before their forces broke through German defences. Some hoped to break the stalemate by utilizing science and technology. In April 1915, the Germans used chlorine gas for the first time, opening a four mile wide hole in the Allied lines when French colonial troops retreated before it. This breach was closed by Canadian soldiers at Ypres, earning German respect. Neither side proved able to deliver a decisive blow for the next four years, though protracted German action at Verdun throughout 1916, and the Entente's failure at the Somme in the summer of 1916 brought the French army to the brink of collapse. Futile attempts at more frontal assaults, at terrible cost to the French poilu (infantry), led to mutinies which threatened the integrity of the front line after the Nivelle Offensive in spring of 1917. News of the Russian Revolution gave a new incentive to socialist sentiments. Red flags were hoisted and the Internationale was sung on several occasions. At the height of the mutiny, 30,000 to 40,000 French soldiers participated. Throughout 1915-17 the British Empire and France suffered many more casualties than Germany, but both sides lost millions of soldiers to injury and disease.

Around 800,000 soldiers from the British Empire were on the Western Front at any one time, 1,000 battalions each occupying a sector of the line from Belgium to the Arne and operating a month-long four stage system, unless an offensive was underway. The front contained over 6,000 miles of trenches. Each battalion held its sector for around a week before moving back to support lines and then the reserve lines before a week out-of-line, often in the Poperinge or Amiens areas.

Southern theatres

Ottoman Empire

Main article: Middle Eastern theatre of World War I

The Ottoman Empire joined the Central Powers in October–November 1914, due to the secret Turko-German Alliance signed on August 2, 1914, threatening Russia's Caucasian territories and Britain's communications with India and the East via the Suez canal. British Empire action opened another front in the South with the Gallipoli (1915) and Mesopotamian campaigns, though initially the Turks were successful in repelling enemy incursion. In Mesopotamia, by contrast, after the disastrous Siege of Kut (1915–16), British Empire forces reorganized and captured Baghdad in March 1917. Further to the west in the Sinai and Palestine Campaign, initial British failures were overcome with Jerusalem being captured in December 1917 and the Egyptian Expeditionary Force under Edmund Allenby going on to break the Ottoman forces at the Battle of Megiddo (September 1918).

Russian armies generally had the best of it in the Caucasus. Enver Pasha, supreme commander of the Turkish armed forces, was a very ambitious man, with a dream to conquer central Asia. He was not a practical soldier. He launched an offensive with 100,000 troops against the Russians in the Caucasus in December of 1914. Insisting on a frontal attack against Russian positions in the mountains in the heart of winter, Enver lost 86% of his force at the Battle of Sarikamis. The Russian commander from 1915 to 1916, General Yudenich, with a string of victories over the Ottoman forces, drove the Turks out of much of present-day Armenia, and tragically provided a context for the deportation and genocide against the Armenian population in eastern Armenia. In 1917 Grand Duke Nicholas took operational control away from Yudenich. With control of part of the southern Black Sea coast, Nicholas pushed forward the construction of railway lines to bring up supplies. He was ready for an offensive in the spring of 1917. But, because of the Russian Revolution, no offensive was launched and the Russian armies soon fell apart.

Italian participation

Main article: Italian Campaign (WWI)

Italy had been allied to the German and Austro-Hungarian Empires since 1882, but had its own designs against Austrian territory in the Trentino, Istria and Dalmatia, and a secret 1902 understanding with France effectively nullifying its alliance commitments. Italy refused to join Germany and Austria-Hungary at the beginning of the war, because the alliance was defensive, while Austria declared war on Serbia. The Austrian government started negotiations to obtain Italian neutrality in exchange for French territories (Tunisia), but Italy joined the Entente by signing the London Pact in April and declaring war on Austria-Hungary in May 1915; it declared war against Germany fifteen months later.

In general, the Italians enjoyed numerical superiority, but were poorly equipped; instead, the Austro-Hungarian defence took advantage of the elevation of their bases in the mostly mountainous terrain, which was anything but suitable for military offensives. For the most part the front remained unchanged during the war, while Austrian Kaiserschützen and Standschützen and Italian Alpini fought bitter close combat battles during summer and tried to survive during winter in the high mountains.

Beginning in 1915, the Italians mounted 17 major offensives on the Isonzo front (the part of the border nearest Trieste), all repelled by the Austro-Hungarians, who had the higher ground. The Austro-Hungarians counter-attacked from the Altopiano of Asiago towards Verona and Padua in the spring of 1916 (Strafexpedition), but they also made little progress. In the summer, the Italians took back the initiative, capturing the town of Gorizia. After this minor victory, the front remained practically stable for over one year, despite several Italian offensives, again all on the Isonzo front. In the fall of 1917, thanks to the improving situation on the Eastern front, the Austrians received large reinforcements, including German assault troops. On October 26, they launched a crushing offensive that resulted in the victory of Caporetto: the Italian army was routed, but after retreating more than 100km, it was able to reorganize and hold at the Battle of the Piave River. In 1918 the Austrians repeatedly failed to break the Italian line, and, decisively defeated in the Battle of Vittorio Veneto, surrendered to the Entente powers in November.

Throughout the war Austro-Hungarian Chief of Staff, Conrad von Hötzendorf had a deep hatred for the Italians because he had always perceived them to be the greatest threat to his state. Their betrayal in 1915 enraged him even further. His hatred for Italy blinded him in many ways, and he made many foolish tactical and strategic errors during the campaigns in Italy.

The War in the Balkans

After repelling three Austrian invasions in August-December 1914, Serbia fell to combined German, Austrian and Bulgarian invasion in October 1915. The Serbian army retreated into Albania and Greece. In late 1915, a Franco-British force landed at Salonica in Greece to offer assistance and to pressure the Greek government into war against the Central Powers. Unfortunately for the Allies, the pro-allied government of Eleftherios Venizelos fell before the allied expeditionary force even arrived, and the pro-German king, Constantine, prevented official Greek entry into the war for two years, until 1917. Meanwhile, the Salonica Front proved entirely immobile, so that it was joked that Salonica was the largest German prisoner of war camp. Only at the very end of the war, after most of the German and Austro-Hungarian troops had been removed and the front had to be held by the Bulgarians alone, were the Entente powers able to make a breakthrough, leading to Bulgaria's signing an armistice on September 29, 1918.

The Eastern Front

A German trench in the swamp area near the Mazuric Lakes on the Eastern Front. Picture taken in February 1915, just before the German winter-offensive started in heavy snowstorms.

Main article: Eastern Front (World War I)

While the Western Front had reached stalemate in the trenches, the war continued in the east. The Russian initial plans for war had called for simultaneous invasions of Austrian Galicia and German East Prussia. Although Russia's initial advance into Galicia was largely successful, they were driven back from East Prussia by the victories of the German generals Hindenburg and Ludendorff at Tannenberg and the Masurian Lakes in August and September 1914. Russia's less-developed economic and military organization soon proved unequal to the combined might of the German and Austro-Hungarian Empires. In the spring of 1915 the Russians were driven back in Galicia, and in May the Central Powers achieved a remarkable breakthrough on Poland's southern fringes, capturing Warsaw on August 5 and forcing the Russians to withdraw from all of Poland, known as the "Great Retreat".

The Russian Revolution

Main article: Russian Revolution

Dissatisfaction with the Russian government's conduct of the war grew despite the success of the June 1916 Brusilov offensive in eastern Galicia against the Austrians, when Russian success was undermined by the reluctance of other generals to commit their forces in support of the victorious sector commander. Allied fortunes revived only temporarily with Romania's entry into the war on August 27: German forces came to the aid of embattled Austrian units in Transylvania, and Bucharest fell to the Central Powers on December 6. Meanwhile, internal unrest grew in Russia, as the Tsar remained out of touch at the front, while Empress Alexandra's increasingly incompetent rule drew protests from all segments of Russian political life, resulting in the murder of Alexandra's favourite Rasputin by conservative noblemen at the end of 1916.

In March 1917, demonstrations in St. Petersburg culminated in the abdication of Tsar Nicholas II and the appointment of a weak centrist Provisional Government, which shared power with the socialists of the Petrograd Soviet. This division of power led to confusion and chaos, both on the front and at home, and the army became progressively less able to effectively resist Germany.

Vladimir Lenin

The war, and the government, became more and more unpopular, and the discontent led to a rise in popularity of the Bolshevik party, led by Vladimir Lenin, who were able to gain power. The triumph of the Bolsheviks in November was followed in December by an armistice and negotiations with Germany. At first, the Bolsheviks refused to agree to the harsh German terms, but when Germany resumed the war and marched with impunity across Ukraine, the new government acceded to the Treaty of Brest-Litovsk on March 3, 1918, which took Russia out of the war and ceded vast territories including Finland, the Baltic provinces, Poland and Ukraine to the Central Powers.

After the Russians initially dropped out of the war, Entente led a small-scale invasion of Russia. The invasion was made with intent to punish the Russians for dropping out of World War I and to support the Tsarists in the Russian Revolution. Troops landed in Archangel (see North Russia Campaign) and in Vladivostok. The Entente forces were told they were invading to defend supplies from German troops. In reality, they were defending them from communist Russians.