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June 28
Archiduque Franz Ferdinand is assassinated in Sarajevo

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July 23
Austria-Hungary makes demands on Serbia for retribution. Serbia does not meet demands.

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July 28
Austria-Hungary declares war on Serbia. Russia begins mobilizing its troops.

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August 1
Germany declares war on Russia.

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August 3
Germany declares war on France as part of the Schlieffen Plan.

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August 4
Germany invades Belgium. Britain declares war on Germany.

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August 23 to 30
The Battle of Tannenberg is fought between Germany and Russia. The Germans defeat the Russian Second Army.

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September 5 to 12
The advancing German army is stopped before Paris by the British and French at the First Battle of the Marne. The Germans dig in and four years of trench warfare begins.

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October 19 to November 22
The Allies defeat the Germans at the First Battle of Ypres.

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November 2
The British begin a naval blockade of Germany.

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The Ottoman empire declares  war on the Allies.

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December 24
An unofficial truce is declared between the two sides at Christmas.

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February 4
The Germans begin to use submarines against Allied merchant ships around the island of Britain.

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Boats and boating--Equipment and supplies

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April 25
The Allies attack the Ottoman empire at the battle of Gallipoli.

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May 7
The Lusitania is sunk by a German submarine.

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October 14
Bulgaria enters the war by declaring war on Serbia.

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February 21
The battle of Verdun begins between France and Germany.

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May 31
The largest naval battle, the battle of Jutland

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July 1
The battle of Somme begins. Over 1 million of soul diets will be wounded or killed.

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January 19
The British intercept the Zimmerman Telegram in which Germany tries to convince Mexico to join the war. US declares war on Germany

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March 8
The Russian Revolution begins. Tsar Nicholas II is removed from the power.

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April 6
The US enters the war

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November 7
The Bolsheviks, led by Vladimir Lenin, overthrow the Russian government.

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December 17
The Russians agree to peace with the Central powers and leave the war.

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January 8
President Woodrow Wilson issues his “Fourteen Points”.

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March 21
Germany launches the Spring Offensive hoping to defeat the allies before reinforcements from the United States can be deployed.

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July 15
The second battle of The Marne begins.

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November 11
Germany agrees to an armistice and the fighting comes to an end at 11am on the 11th day of the 11th month.

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June 28
The treaty of Versailles is signed by Germany and WWI comes to an end.