During World War II, as Air Officer Commanding of the RAF Middle East Command, Tedder directed RAF air operations in the Mediterranean and North Africa, including the evacuation of Crete and Operation Crusader in North Africa. His bombing tactics became known as the Tedder Carpet. Later in the war Tedder took command of the Mediterranean Air Command and in that role was closely involved in the planning of the Allied invasion of Sicily and the Allied invasion of Italy. When Operation Overlord—the invasion of France—came to be planned, Tedder was appointed Deputy Supreme Commander at Supreme Headquarters Allied Expeditionary Force under General Dwight D. Eisenhower.