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April 25th 1915
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May 7th 1915
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May 23rd 1915
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September 5th 1915
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January 27th 1916
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February 21st 1916
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November 21st 1916
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December 7th 1916
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Allied forces land at Gallipoli
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A German U-boat sinks RMS Lusitania
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Italy declares war on Austria-Hungary
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Nicholas II takes personal command of the Russian army
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British government introduces conscription
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Germans initiate the Battle of Verdun
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The death of Austrian emperor Franz Joseph
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Lloyd George becomes British prime minister