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Franz Ferdinand is killed
Archduke Franz Ferdinand, heir to the throne of the Austro-Hungarian Empire, and his wife are shot by Gavrilo Princip. -
Austria-Hungary declares war on Serbia.
Enraged by the assassination of Franz Ferdinand, Emperor Franz Joseph of Austria-Hungary declares war on Serbia. -
Germany declares war on Russia.
Declaring war on Russia, Germany mobilizes their armed forces to attack. -
Germany declares war on France.
Two days after declaring war on Russia, Germany declares war on France, and hours later, France declares war on Germany. -
The Battle of the Frontiers occurs.
The Battle of the Frontiers takes place. Over 27,000 French soldiers died on this one day. -
Christmas Truce declared.
Christmas Truce declared by soldiers in the trenches along the Western Front.