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Germany declares a "war zone" around Great Britain,
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Germany declares war on France.
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President Woodrow Wilson says the U.S will not fight yet
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The Battle of Tannenberg is started
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The unofficial Christmas truce is declared.
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The Second Battle of Ypres the battle that the Germans first use poison gas.
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The Battle of Jutland, the major naval battle of the war,
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Battle of the Somme, tanks are first introduced
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The United States declares war on Germany.
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German pilot Baron Manfred von Richthofen (Red Baron), is shot down.