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1914 June 28

Assassination of Archduke Franz Ferdinand of Austria, heir to the Austro-Hungarian throne, who was killed in Sarajevo along with his wife Duchess Sophie by Bosnian Serb Gavrilo Princip.

July 5

Austria-Hungary seeks German support for a war against Serbia in case of Russian militarism. Germany gives assurances of support.

1915 January 2

The Russian offensive in the Carpathians begins. It will continue until April 12.

January 18–19

Battle of Jassin.

1916 January 5–17

Austro-Hungarian offensive against Montenegro, which capitulates.

January 6–7

Battle of Mojkovac.

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