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Archduke Franz Ferdinand, heir to Austria-Hungary's throne, and his wife, Sophie, are assassinated by Serbian nationalist Gavrilo Princip while the couple were visiting Sarajevo, Bosnia.
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Austria-Hungary declares war on Serbia
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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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Russia's Second Army fought against the German Eight Army between August 26th - August 30th.
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The Battle of the Marne was a First World War battle. It resulted in an Allied victory against Germany.
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The first Battle of Ypres also known as the First Battle of Flanders, was fought for the strategically important town of Ypres in western Belgium.
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The United Kingdom announces that the North Sea is a military aream effectively creating a blockade of goods into Germany.
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The Christmas truce was a series of Unofficial ceasefires that took place along the Western Front around Christmas 1914.
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Germany Declares a "war zone" around Great Britain, essesntially effecting a submarine blockade where even neutral merchant vessels were to be potential targets.
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The Dardenelles Campaign started out as just a naval operation. When that failed to overcome Ottoman defences, an invasion of the Gallipoli peninsula was launched in which naval forces were heavily involved.
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The Second Battle of Ypres was a battle of the First World War gought from April 21 - May 25 for control of the strategic Flemish town of Ypres.
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The Gallipoli Campaign, also known as the Battle of Gallipoli, was a World War 1 campaign that took place on the Gallipoli penisula in the Ottoman Empire.
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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 1 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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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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Russian Tsar Nicholas II abdicates.
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The United States declares war on Germany.
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The Battle of Passchendaele (also known as 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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Russia signs the Treaty of Brest Litovsk, which is a peace treaty between Russia and the Central Powers.
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Germany launches the Spring Offensive.
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German flying ace, Baron Manfred von Richthofen (more commonly known as the Red Baron), is shot down.
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The Second Battle of the Marne begins.
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German Kaiser Wilhelm II abdicates and flees Germany.
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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.
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The Treaty of Versailles officially ends World War 1.
