The British and American bombing of Germany had become so effective that most of the German industrial system was destroyed. However, early in the War, Germany had violated the Geneva Convention and was indiscriminately bombing London and other part of England. In addition the German Air Force had bombed Warsaw, and many other cities throughout Europe. The German’s had killed over 20 million Europeans. When the Allied bombing produced high collateral damage against civilians, some argued that even though German had deliberately used this tactic, the allies should stop the saturated bombing if there were to be high civilian collateral damage. Others argued that it was unfortunate but a military necessity. There were others like Brenen, who argued that killing German women and children was desirable and just.