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| 1939 March 31 |
| | The recent fate of Czechoslovakia prompts France and Britain to guarantee the security of Poland | |
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| 1939 May 3 |
| | Stalin appoints Vyacheslav Molotov as People's Commissar of Foreign Affairs for the USSR | |
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| 1939 August |
| | A Franco-British military mission arrives in Moscow to persuade Stalin to join a pact in defence of Poland | |
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| 1939 August |
| | Helped by the results of Polish cryptographers, Bletchley Park begins to gain invaluable access to German military secrets | |
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| 1939 May 11 |
| | An incident on the border between Japanese Manchukuo and Soviet territory sparks a four-month war with the USSR that brings heavy Japanese losses | |
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| 1939 August 2 |
| | German-born US physicist Albert Einstein writes to President Roosevelt, warning of the potential of an atomic bomb | |
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| 1939 August 21 |
| | Ribbentrop flies to Moscow to sign a Nonaggression Pact with Molotov, depriving Britain and France of an ally | |
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| 1939 August 21 |
| | A secret protocol, attached to the Molotov-Ribbentrop Pact, divides Poland and the Baltic states between Germany and Russia | |
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| 1939 August 27 |
| | The He-178, designed by Hans von Ohain, becomes the first jet engine to fly, with a test flight lasting five minutes | |
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| 1939 September 1 |
| | Adolf Hitler launches a massive attack on Poland, with tanks crossing the border and air raids on Warsaw | |
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