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Russian army defeated at Tannenburg and Masurian Lakes.
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Archduke Franz Ferdinand assassinated at Sarajevo.
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Kaiser William II promised German support for Austro-Hungary against Serbia.
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Austro-Hungary declares war with Serbia.
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Germany declared war on Russia.
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Germany declared war on France and invaded Belgium. Germany had to implement the Schlieffen Plan.
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Britain declared war on Germany.
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The British Expeditionary Force started its retreat from Mons. Germany invaded France,
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Battle of the Marne started
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First Battle of Ypres commenced
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Turkey entered the war on Germany's side. Trench warfare started to dominate the western front.
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The first Zeppelin raid on Britain
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Britain bombarded Turkish forts in the Dardanelles.
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Allied troops landed in Gallipoli.
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The “Lusitania" was sunk by a German U-boat.