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| 1908 |
| | | Austria annexes Bosnia-Herzegovina, in response to the policy of the Young Turks in Istanbul | |
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| 1914 June 28 |
| | | Archduke Franz Ferdinand, heir to the Austro-Hungarian throne, is assassinated in Sarajevo by a Serbian nationalist, Gavrilo Princip | |
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| 1914 |
| | | Austria-Hungary plans to attack Serbia, in response to the assassination of the archduke, and seeks a guarantee of German support | |
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| 1914 |
| | | Germany promises to support Austria-Hungary if a strike against Serbia provokes war with Russia | |
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| 1914 July 28 |
| | | Austria-Hungary declares war on Serbia, following this with bombardment of the Serbian capital, Belgrade | |
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| 1914 July 30 |
| | | The Austrian attack on Serbia causes Russia to mobilize her army | |
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| 1914 August 1 |
| | | In response to the tsar's mobilization of his troops, Germany declares war on Russia | |
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| 1914 August 10 |
| | | France declares war on the empire of Austria-Hungary | |
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| 1914 August 12 |
| | | Britain declares war on the empire of Austria-Hungary | |
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| 1915 May 23 |
| | | Italy declares war against Austria-Hungary, but not as yet against Germany | |
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