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Austria-Hungary declares war on Russia.
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First trenches of the Western front are dug.
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War becomes "Total War" with German Zeppelin air raid on England
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Germany declares a submarine blockade of Great Britain. Any ship approaching England is considered a legitimate target.
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Canadians take Vimy Ridge
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The Battle of Jutland, the only major naval engagement of the war is fought with no clear winner.
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Germany again declares unrestricted submarine warfare.
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The first wave of the American Expeditionary Force lands in France.
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Germans launch the first of five major offensives to win the war
Germans launch the first of five major offensives to win the war before American troops appear in the trenches. German advance is finally stopped in late June -
President Wilson agrees to co-operate with Allies in sending "volunteer" troops into Russia.