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Ottoman Empire
The Ottoman Empire signs a secret alliance with Germany agreeing to enter the war once Germany declares war on Russia. They formally enter the war several months later on October 28, 1914, when they bomb Russian seaports. -
Archduke Assassination
Archduke Franz Ferdinand, heir to the throne of the Austro-Hungarian Empire, and his wife are assassinated. -
Declared War on Serbia
Emperor Franz Joseph of Austria-Hungary declares war on Serbia.