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Austria-Hungary declares war on Serbia
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Period: to
ww1
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Germany declares war on Russia.
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Germany declares war on France.
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The United Kingdom declares war on Germany, after Germany invades Belgium.
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The battle of Tannenburg begins
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The First Battle of the Marne begins. Trench warfare begins as soldiers on both sides dig in.
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Battle of Ypres begins.
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The unofficial Christmas truce is declared.
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Germany declares a "war zone" around Great Britain, essentially effecting a submarine blockade where even neutral merchant vessels were to be potential targets.
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The Battle of Gallipoli begins.
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February 21 - The Battle of Verdun begins. The Battle of Verdun was the longest battle of World War I and was one of the bloodiest.
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April 6 - The United States declares war on Germany.
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U.S. President Woodrow Wilson issues his Fourteen Points to peace.
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The Treaty of Versailles officially ends WWI.
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The Treaty of Versailles officially ends WWI.