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World War One Begins: Russia, France, and Britain against Germany and Austria-Hugary
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Austria-Hungary declares war on Serbia
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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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Austria-Hungary declares war on Russia and Serbia declares war on Germany.
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U.S. President Woodrow Wilson announces the U.S. will remain neutral
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Battle of Tannenberg 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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The Dardanelles Campaign begins
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The Battle of Gallipoli begins
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Tsar Nicholas II takes personal control over Russia's armies.
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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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The Battle of the Somme begins. During the Battle of the Somme, tanks are first introduced into battle
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The United States declares war on Germany
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Russia signs the Treaty of Brest Litovsk, which is a peace treaty between Russia and the Central Powers
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The Second Battle of the Marne begins.
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Germany signs the armistice at Compiegne, France. Fighting ends on the 11th hour of the 11th day of the 11th month