 The magnitude and ferocity of the German Ardennes Offensive came as a shock and Strong was criticised for failing to predict it . However Smith defended Strong against criticism for failing to sound the alarm , feeling that Strong have given ample warning , which had been discounted or disregarded by himself and others . By 19 December , Strong had become concerned that the Germans were going to split Bradley 's armies , and he and Whiteley – who had already received Monty 's opinion on the matter – went to Smith , recommending that the armies north of the Ardennes be transferred from Bradley to Montgomery 's command . Smith realised the military and political implications of this , and knew that such a recommendation had to come from an American officer . On 20 December , Smith spoke to Eisenhower , who deferred judgement until the morning staff meeting . Eisenhower then phoned Bradley and Montgomery and ordered it . The decision was greatly resented by many Americans , particularly at 12th Army Group . 
