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1
Archduke Franz Ferdinand, prince to the Austria-Hungary throne, is assassinated in Sarajevo by a Serbian named Gavrilo Princip -
2
The British begin a naval blockade of Germany. -
3
An unofficial truce is declared between the two sides at Christmas -
4
The Germans begin to use submarines against Allied merchant ships around the island of Britain -
5
Bulgaria enters the war by declaring war on Serbia -
6
The Battle of Verdun begins between France and Germany -
7
The Battle of the Somme begins. Over 1 million soldiers will be wounded or killed -
8
The British intercept the Zimmerman Telegram in which Germany tries to convince Mexico to join the war. This will result in the United States declaring war on Germany -
9
The Russians agree to peace with the Central powers and leave the war -
10
President Woodrow Wilson issues his "Fourteen Points" for peace and an end to the war -
11
The Second Battle of the Marne begins -
12
The Treaty of Versailles is signed by Germany and World War I comes to an end