How about London? The Germans started targeting civilian population centers, The RAF just gave back what they got from the Luftwaffe, V1 buzz bombs, and V2 ballistic missiles.
I brought up the two German cities as their death toll approached that of Hiroshima. Nothing intended against the Brits.
I thought the first German bombing of London was a complete mistake? A navigation error accompanied with the mis-identification of the lights of London.
Both sides had somewhat of a “gentlemen’s agreement” about bombing London or Berlin.
Which is precisely why the Germans lost the Battle of Britain. After Berlin was bombed, Hitler wanted to focus on bombing civilians instead of strategic military facilities, it was the breather the British needed.