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Franz Ferdinand and his wife were assassinated.
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The Battle of the Frontiers-27,000 French people die.
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Christmas Truce declared by soldiers along the western front.
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Germany declares a submarine blockade of Great Britain-any ship is a target.
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Germany responds to the U.S. anger by ceasing to sink ships without warning.
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British use gas near Loos, but shifting winds cause 60,000 British casualties.
Use gas -
The longest battle of the war, The Battle of Verdun, is fought to draw estimated 1 million casualties
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U.S. President Wilson publicly warns Germany not to continue unrestricted submarine war fair policies.
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The Battle of Somme results in 1 million casualties and no break for the Allies.
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British introduce the tank.
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Over half a million French soldiers "go on a strike" and refuse to continue the failed offensive.
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President Wilson asks congress for a declaration of war with Imperial Germany.
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French lost at Chemin des Dames, advancing 500 yards at the cost of 250,000 casualties
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First wave of the American expeditionary force lands in France.
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American troops fire their first shot in trench warfare.
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World War 1 ends.