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The members of each side declare war on thier enemies and begin to mobilize.(England,France,Russia) Vs. (Germany,Austria-Hungary,Italy)
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September 5 - The First Battle of the Marne begins. Trench warfare begins as soldiers on both sides dig in
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October 19 - Battle of Ypres begins.
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December 24 The unofficial Christmas truce is declared.
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April 22 - The Second Battle of Ypres begins. It is during this battle that the Germans first use poison gas
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April 25 - The Battle of Gallipoli begins.
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May 7 - The British ocean liner RMS Lusitania is sunk by German U-boat, U-20
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September 5 - Tsar Nicholas II takes personal control over Russia's armies
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February 21 - The Battle of Verdun begins. The Battle of Verdun was the longest battle of World War 1 and was one of the bloodiest.
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May 31 - 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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Germany sends the secret Zimmerman Telegram to Mexico in an effort to entice Mexico to join the war. The British intercept and decipher the coded message.
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March 15 - Russian Tsar Nicholas II abdicates.
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April 6 - The United States declares war on Germany.
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July 31 - The Battle of Passchendaele (also known as the Third Battle of Ypres) begins.
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November 7 - The Bolsheviks successfully overthrow the Russian government.
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December 17 - The armistice agreed upon between the new Russian government and the Central Powers goes into effect.
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January 8 - U.S. President Woodrow Wilson issues his Fourteen Points to peace.
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March 3 - Russia signs the Treaty of Brest Litovsk, which is a peace treaty between Russia and the Central Powers.
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March 21 - Germany launches the Spring Offensive.
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April 21 - German flying ace, Baron Manfred von Richthofen (more commonly known as the Red Baron), is shot down.
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July 15 - The Second Battle of the Marne begins
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November 9 - German Kaiser Wilhelm II abdicates and flees Germany.
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November 11 - Germany signs the armistice at Compiegne, France. Fighting ends on the 11th hour of the 11th day of the 11th month (i.e. 11 a.m. on November 11).
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June 28 - The Treaty of Versailles officially ends World War 1