The Combined Chiefs of Staff authorised Morgan to issue orders in the name of the Supreme Allied Commander to the Commanders in Chief of the Air, Naval and Land Forces, even though they outranked him. In December 1943, when General Sir Bernard Montgomery, who had just arrived in England after commanding the British Eighth Army on the Italian Front, was appointed C-in-C Land Forces for the invasion, he declared that Morgan's original plans were impracticable; they had originally been limited by the availability of landing craft, but Montgomery insisted it would require more men attacking over a wider front. Ultimately, more landing craft were obtained and the invasion was scaled up to Montgomery's satisfaction, at the cost of a month's delay and a reduction in the Southern France operation. However, all the key features of Morgan's plan remained; the choice of Normandy as the assault area, the use of Mulberry harbours, the deployment of American forces on the right and British on the left, the use of airborne troops to cover the flanks, and some form of diversionary operation in Southern France.