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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 August 1 |
| | | In response to the tsar's mobilization of his troops, Germany declares war on Russia | |
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| 1914 August 2 |
| | | Germany and the Ottoman empire sign a secret treaty of alliance | |
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| 1914 August 3 |
| | | With her troops already poised to attack, Germany declares war on France | |
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| 1914 August 4 |
| | | Bound by treaty to defend Belgium, Britain declares war on Germany | |
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| 1914 August |
| | | British and French forces invade the German colony of Togoland | |
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| 1914 October 29 |
| | | Turkey, launching an attack on Russian ports in the Black Sea, enters the war on the German side | |
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| 1915 |
| | | February - British and French forces invade and capture the German colony of Cameroon | |
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| 1915 July |
| | | South African troops capture German South West Africa | |
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