 Complete the following phrase:  In 1943, the 4th Parachute Brigade, although still part of the 1st Airborne Division, was kept out of the Allied invasion of Sicily by a shortage of transport aircraft. The 1st Airlanding Brigade took part in Operation Ladbroke and the 1st Parachute Brigade in Operation Fustian. Both brigades suffered heavy casualties, so that by the time Operation Slapstick was proposed, only the 2nd and 4th Parachute Brigades were up to strength. Slapstick was in part a deception operation to divert German forces from the 