Germany invaded Poland in the free city of Danzig, which started World War II.
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The British Broadcasting Corporation (BBC) resumed TV broadcasting for the first time since the end of WWII.
British bomber planes obliterated 89% of Würzburg, Germany, within just 20 minutes.
Germany invades Denmark and Norway.
The Battle of Hürtgen Forest began during World War II.
The worst German air raid of the Blitz occurred.
