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He was assassinated in Sarajevo, most likely by the Serbians.
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Austria-Hungary declares war on Serbia.
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German forces shock Allied soldiers along the Western Front by firing more than 150 tons of lethal chlorine gas against two French colonial divisions at Ypres in Belgium.
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The Allies launched their invasion of the Gallipoli Peninsula
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The British government authorized the evacuation to begin from Suvla Bay on December 7; the last troops left Helles on January 9, 1916.
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British empire fights the German empire alongside the French Third Republic.
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British cryptographers deciphered a telegram from German Foreign Minister Arthur Zimmermann to the German Minister to Mexico, Heinrich von Eckhardt, offering United States territory to Mexico in return for joining the German cause.
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Ended Russia's participation in WW1
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The treaty forced Germany to surrender colonies in Africa, Asia and the Pacific