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| 1925 |
| | | A Protocol signed in Geneva probibits the use in warfare of poisonous gas and bacteriological weapons | |
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| 1925 |
| | | The German navy adapts a civilian encryption machine, Enigma, for military purposes | |
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| 1928 |
| | | Beijing falls to Kuomintang forces, extending the rule of Jiang Jieshi's National Government into the north of China | |
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| 1931 |
| | | The Japanese occupy the Chinese state of Manchuria | |
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| 1932 |
| | | The Chaco War breaks out between Bolivia and Paraguay, in dispute over the swampy plain known as the Gran Chaco | |
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| 1933 |
| | | Polish cryptographers succeed in breaking some of the Enigma code used by the German military | |
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| 1935 |
| | | Adolf Hitler reinstates Germany's airforce, the Luftwaffe, putting Hermann Goering in command | |
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| 1935 |
| | | A truce ends armed hostilities in the three-year Chaco War between Bolivia and Paraguay | |
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| 1935 |
| | | Adolf Hitler gives Karl Dönitz, a submarine commander from World War I, responsibility for Germany's U-boat programme | |
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| 1935 |
| | | Mussolini uses a disagreement over grazing rights as a pretext for an empire-building invasion of Ethiopia | |
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