the Eighth Army was still engaged in the Tunisian campaign, planning was in train in Algiers and Cairo for Operation Husky, the Allied invasion of Sicily. Unable to devote much time to it but concerned at how it was progressing, Montgomery decided that de Guingand would go to Cairo as his deputy, in charge of the planning group known as Force 545. In view of his new status and increased responsibility, de Guingand was granted the local rank of major-general. He arrived in Cairo on 15 April. On taking over the planning for Operation Husky, he became concerned that it called for a series of dispersed landings based on the assumption that the German and Italian forces would not mount a fierce resistance. This ran contrary to the Eighth Army's experience with them in the North African campaign. Montgomery listened to de Guingand's appreciation on 23 April and then sent a message to the Supreme Allied Commander, General Dwight D. Eisenhower in Algiers, urging that the invasion plan be changed to concentrate the landings. Montgomery flew back to Tunisia on 26 April. His message had not been not received warmly in Algiers and Alexander had called a conference to discuss it. Montgomery fell ill, so he asked de Guingand to attend in his place. De Guingand's plane landed at El Adem to refuel. On attempting to take off, it crashed. The aircraft was a write-off but none of those on board were killed. De Guingand suffered a series of fractures and a concussion. He was unconscious for several hours and was flown back to Cairo in an ambulance plane. Staff officers retrieved his briefcase containing the invasion plans for Operation Husky from his wife's flat in Cairo. After consulting some X-ray images, the doctors gave him two weeks' sick leave. Eventually Montgomery managed to convince Major-General Walter Bedell Smith, Eisenhower's chief of staff, of the merit of his plan and Smith was able to convince Eisenhower on 3 May. With the notable exception of Operation Ladbroke the airborne landing, which failed, the Eighth Army's assault on 10 July was successful. Montgomery went ashore the following day, only to find that his headquarters vehicles were missing. A sharp signal was sent to de Guingand, who managed to sort the problem out. For his services in Sicily, de Guingand was appointed Companion of the Order of the Bath on 12 October. Even