 The offensive had also been scheduled to take place when the weather prohibited Allied air support.The Wehrmacht suffered nearly 750,000 casualties between June and November 1944, forcing the German leadership to recruit from the Kriegsmarine, Luftwaffe, and industry, while extending the call-up age to all males between 16 and 60 years of age.This extension allowed the Germans to increase their manpower in Western Europe from around 410,000 on 1 December to just over 1.3 million on 15 December.