He and the High Command thought it was a diversion. In fact, they viewed it as a stupid diversion. Very simply, Normandy had TWO ports of note, Cherbourg and Le Havre. Accordingly, the Germans had heavily fortified both: They thought the Allied invasion would happen in the vicinity of Calais. However, late in the morning June 6th, the High Command got troubled by the SIZE of the diversion. The only tank division in the immediate vicinity was the 21st Panzer Division: