As described in To Win The Winter Sky, the USAAF pulled an interesting "dirty trick" during the Bulge. When the weather cleared enough for ground attack aircraft to attack the Germans, and knowing that the Germans would use all of their available fighters to try to keep the attacks from being successful, the USAAF would pick out a nearby German City. Heavy bombers from England would attack the city at the same time that the Allied fighter bombers were hitting the German troops in the Bulge. The Luftwaffe was faced with being unable to both stop the fighter bomber attacks and defend the city. The militarily correct choice would have been to try to intercept the fighter bombers and at least get them to jettison their bomb and rocket loads. But at the time the Luftwaffe was having trouble being able to hold its head up in public. They were often told things like, "Yesterday 500 American bombers hit our city and the Luftwaffe was no where to be seen." In reality the Luftwaffe was up there, too, trying to defend the city while being outnumbered 10 to 1 and taking huge losses, but on the ground it was not apparent they were even in the game. So the Luftwaffe would have to assign some fighters to defend the city, even though it would not aid the ground battle..