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Austria-Hungary declares war on Serbia
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Germany declares war on Russia
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The United Kingdom declares war on Germany, after Germany invades Belgium.
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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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The United Kingdom announces that the North Sea is a military area, effectively creating a blockade of goods into Germany.
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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 Second Battle of Ypres begins. It is during this battle that the Germans first use poison gas
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The British ocean liner RMS Lusitania is sunk by German U-boat, U-20
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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 Jutland, the major naval battle of the war, begins
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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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Bolsheviks overthrow the provisional government
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U.S. President Woodrow Wilson issues his Fourteen Points to peace.
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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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