Austria-Hungary had taken over Bosnia. The Archduke Franz Ferdinand (who was heir to the A-H throne) visited the Bosnian capital of Sarajevo to view the A-H troops stationed there. A Bosnian-Serb revolutionary named Gavrilo Princip assassinated the Archduke because he wanted freedom for Slavic peoples in the Balkans. Austria-Hungary blamed Serbia for the act.Germany promised to give Austria-Hungary help if it went to war with Serbia. War broke out between Austria-Hungary and Serbia. Russia came to the aid of Serbia: other allies took sides to war as well.

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