Actually I believe that the RAF bombed a German city by accident due to getting a little lost since the bombing mission was at night time, Hitler on the other hand was soooo furious he ordered immediate retaliation. In fact this might be the very same reason why the RAF survived, due to Hitler's decision to bomb cities instead of planes and airports....

Please correct me if im wrong.

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The war against Russia will be such that it cannot be conducted in a knightly fashion. This struggle is one of ideologies and racial differences and will have to be conducted with unprecedented, unmerciful and unrelenting harshness. -Adolf Hitler