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Triple Alliance is formed between Germany, Italy and Austria-Hungary
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Triple Entente is formed between Britain, France and Russia
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Franz Ferdinand is assassinated in Sarajevo
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Austria-Hungary presents 10 demands to Serbia
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Serbia agrees to only 9 of the 10 demands made by Austria-Hungary
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Austria-Hungary declares war on Serbia
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Russia promises support for Serbia
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Germany declares war on Russia
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Germany declares war on France and invades Belgium
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Britain declares war on Germany (Australia becomes involved)
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Austria-Hungary declares war on Russia
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Japan (an ally of Britain) declares war on Germany
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World War I battle fought at Tannenberg, East Prussia (now Stębark, Poland), that ended in a German victory over the Russians.
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Trench warfare begins on the Western Front
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Turkey enters the war on the side of Germany
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First Zeppelin raid on Britain
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The sinking of the Cunard ocean liner RMS Lusitania occurred on Friday, 7 May 1915 during the First World War, as Germany waged submarine warfare against the United Kingdom which had implemented a naval blockade of Germany.
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Italy enters the war on the side of the Triple Entente
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The evacuation of Anzac Cove began on 15 December, with 36,000 troops withdrawn over the following five nights.
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The Somme was a battle of the First World War fought by the armies of the British Empire and the French Third Republic against the German Empire.
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The Armistice is signed and the war ends