Timeline of World War I and II: Key Events
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World War I: 1914
- June 28: Archduke Franz Ferdinand, prince to the Austria-Hungary throne, is assassinated in Sarajevo by a Serbian named Gavrilo Princip.
- July 23: Austria-Hungary makes demands on Serbia for retribution. Serbia does not meet demands.
- July 28: Austria-Hungary declares war on Serbia. Russia begins mobilizing its troops.
- August 1: Germany declares war on Russia.
- August 3: Germany declares war on France as part of the Schlieffen Plan.
- August 4: Germany invades Belgium. Britain declares war on Germany.
- August 23 to 30: The Battle of Tannenberg is fought between Germany and Russia. The Germans defeat the Russian Second Army.
- September 5 to 12: The advancing German army is stopped before Paris by the British and French at the First Battle