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Shot dead in Sarajevo
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Austria-Hungary declares war on Serbia on 28 July.
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Britain wanted to go to war with Germany
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British and French forces invade German Colonies in Africa
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The Battle of Mons in Belgium is the British Army's first engagement in France.
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As the German Army advances towards Paris, French and British soldiers counterattack along the line of the River Marne.
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At the Battle of La Bassee in northern France Indian soldiers join the Allies for the first time.
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In the Far East, Britain has an ally Japan. Fresh from victory in the Russo-Japanese war, the Japanese flex their military muscles.
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Both sides experiment with tear gas in the first winter of the war.
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Bogged down in a stalemate on the Western Front, the Allies attack Germany's allies in the Middle East, the Ottoman Turks.
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One of the most terrifying new weapons of World War One is the U-Boat. These German submarines patrol Atlantic and Mediterranean trade routes.
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By 1916 heavy losses on the Western Front mean Britain’s volunteer army needs reinforcements.
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At the start of 1916 the opposing forces are fighting a frustrating war of attrition on the Western Front.
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The German fleet leaves the safety of its ports in a bid to shell the English coast and attack an element of the British fleet.
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The Battle of the Somme is one of the largest and bloodiest conflicts of World War One. Nearly 20,000 British soldiers die on the first day.
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In January 1917 Germany sends a message to Mexico, the infamous 'Zimmerman' telegram, inciting it to attack the US.
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In March 1917 there is a popular uprising in Russia and Tsar Nicholas II abdicates.
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With its armies now free from the threat of Russia in the east, Germany mounts a series of major offensives in France in the spring.
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Bolstered by American troops, the Allies carry out a series of sustained attacks, known as the Hundred Days Offensive.
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Before the Allied armies can invade Germany, an armistice is signed, bringing the war on the Western Front to an end.
