Magnum co-founder Robert Capa was attached to the 4th Armored Division as a photographer as it fought toward the surrounded 101st. Richard Whelan notes, in the biography Robert Capa, that the German resistance may have been stiffened by propaganda claiming that every member of the 4th was both ‘a bastard and a matricide’ – the assumption presumably being that such men were unlikely to treat POWs well.On December 23 the weather cleared, allowing Allied air superiority to come into play, with supplies dropped to the 101st, and German forces attacked from above. The same clearing of weather resulted in the freezing of mud, notes Whelan, which in turn allowed American tanks to advance off-road, avoiding German defenses.