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Assassination of Archduke Franz Ferdinand of Austria, the heir to the Austro-Hungarian throne, who is killed in Sarajevo along with his wife, Duchess Sophie.
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Battle of the Yser. French and Belgian forces secure the coastline of Belgium
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The British liner Lusitania is sunk by a German U-boat
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Third Battle of Krithia. Yet another Allied failure
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The United Kingdom declares war on Bulgaria
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The Battle of Verdun begins
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Armando Diaz replaces Luigi Cadorna as Commander-in-Chief of the Italian Army.
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Second battle Battle of Heligoland Bight took place.
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Final phase of the Spring Offensive (Operation Gneiseau). Despite substantial territorial gains, the Germans do not achieve their strategic goals
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Yugoslav independence proclaimed
