Arthur 'Bomber' Harris sanctioned the bombing of the open cities of Dresden and Berlin in supposed retaliation of the bombing of Coventry by the Luftwaffe.
What complicated the issue was that the Brits were well aware of what the Goering had planned but were unable, or at least unwilling to send fighters to stop the German bombing raid. To do so would have tipped off the Germans that the Brits had actually intercepted and decoded German secret messages via Enigma, and Churchill was not prepared for them to know that Enigma existed at that time. He vowed vengage for Coventry and got it. As many people were killed in Dresden as Nagasaki and Hiroshima combined. The fires were so ferocious that they sucked oxygen from the air and even those protected from the smoke and flames died of asphyxiation.
The German's did target the civilian region of Warsaw with Stukas. They broke the will of an already defeated nation by launching wave upon wave of these 'screaming' planes. Charging Panzer divisions on horseback was not a wise strategy but it was all the Poles had, that and courage. The Polish army was filled with very, very brave people, they were outgunned and destroyed but fought like tigers to preserve their homeland.
HS