Mountbatten was in overall command of the raid on Dieppe, however as the Southeast Area Commander, Montgomery was responsible for developing the ground plan for this operation. This he did, it consisted of a frontal assault on Dieppe. Mountbatten’s original plan, which Montgomery changed, called for attacks on the flanks of Dieppe. Monty was reassigned to Egypt before the raid took place. But it was his plan that failed and led to the terrible casualties.