 Gerhard Weinberg stated that the Germans "readily accepted the existence and location" of FUSAG, believed the threat to the Pas de Calais was real and "it was only at the end of July" that they realized a second assault was not coming; "by that time, it was too late to move reinforcements".However, Mary Barbier wrote "it is time to consider that the importance of the deception has been overrated".She argues that 15th Army was largely immobile and not combat-ready, that despite the deception numerous German divisions – including the 1st SS Panzer Division, which was held in reserve behind the 15th Army – from across Europe were transferred to Normandy to repel the invasion, and that the Germans had realized as early as May that a real threat to Normandy existed.