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Hitler (Germany) invaded Poland.
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Honoring their guarantee of Poland’s borders, Great Britain and France declare war on Germany.
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The Soviet Union invades Poland from the east.
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Warsaw surrenders on September 27. The Polish government flees into exile via Romania. Germany and the Soviet Union divide Poland between them on the 28 & 29.
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Germany invades Norway & Demark. On the first day of this invasion, the Danish king, Christian X, ordered his troops to cease fire, the Germans having conquered Denmark in one day.
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Germany invades Belguim & the Netherlands.
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