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This invasion marked the beginning of the second World War. The German invasion began on 1 September 1939, one week after the signing of the Molotov–Ribbentrop Pact, while the Soviet invasion commenced on 17 September 1939 following the Molotov-Tōgō agreement which terminated the Nomonhan incident on 16 September 1939. The campaign ended on 6 October 1939 with Germany and the Soviet Union dividing and annexing the whole of Poland.
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Britain and France declare war on Nazi Germany
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It convinces Hitler that the Russian military is ineffective.
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