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Poison gas is used for the first time by Germans in an attack on the Canadian sector.
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Allied forces land on Gallipoli, Turkey.
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The American naval and military attaches in Paris and London draft a plan for mobilizing US shipping to carry an American army to Europe, but their plan is ignored.
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President Wilson, publicly calls for the German's to stop their submarine policy of sinking all ships in enemy waters without warning.
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Field Marshal Lord Kitchener, the British Secretary of State for War, asks for American military participation in Europe.
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British forces surrender to Turkish forces at Kut in Mesopotamia.
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President Woodrow Wilson delivers war address to Congress at 8:32 pm and asks the House of Representatives to declare war on Germany.
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German forces finish their withdrawal to the Hindenburg Line.
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United States comes out of neutrality and declares war on Germany, thus entering the First World War.
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The Nivelle Offensive begins.
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Canadian troops take Vimy Ridge and the surrounding area in one of Canada's finest battles of the war.
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The Nivelle Offensive, which includes the Second Battle of Aisne and the Third Battle of Champagne ends in French Failure.
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Chemin des Dames Offensive ends in disastrous failure for the French having advanced only 500 yards at the cost of 250,000 casualties. A month long series of mutinies break out amongst the French army.
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Germany launches second Spring offensive, the Battle of the Lys, in the British sector of Armentieres.
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Foch appointed Commander-in-Chief of Allied forces on Western Front.
