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Archduke Franz Ferdinand, heir to Austria-Hungary's throne, and his wife, are assassinated by Serbian nationalist Gavrilo Princip they were visiting Sarajevo.
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Austria-Hungary declares war on Russia. Serbia declares war on Germany.
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The first battle of Marne begins.
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The Dardanelles Campaign begins.
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The second battle of Ypres starts.
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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 Jutland , the major naval battle of the war, begins.
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The battle of Somme, tanks are first introduced into battle.
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Russian Tsar Nicholas II abdicates.
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The United States war against Germany.
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The Third Battle of Ypres begins.
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The Bolsheviks successfully overthrow the Russian government.
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The armistice agreed upon between the new Russian government and the Central Powers goes into effect.
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U.S. president Woodrow Wilson issues his Fourteen Points to peace.
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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 (i.e. 11 a.m. on November 11).
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Germany launches the Spring Offspring.
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Germany flies ace, Red Baron, is shot down.
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The second battle of Marne begins.
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German Kaiser Wilhelm II abdicates and flees Germany.
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The Treaty of Versailles officially ends WWI.
