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Archduke Franz Ferdinand heir to the throne of the Austro-Hungarian Empire, and his wife are assassinated in Sarajevo
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As an ally of Serbia, Russia announces full mobilization of her armed forces.
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France mobilizes troops, Germany declairs war on Russia
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The Second Battle of Ypres was a First World War battle fought for control of the strategic Flemish town of Ypres in western Belgium in the spring of 1915
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