Operation Diadem order of battle
Operation Diadem order of battle is a listing of the significant formations that were involved in the fighting on the Winter Line and at the Anzio bridgehead south of Rome during "Operation Diadem" in May - June 1944 which resulted in the Allied breakthrough at Cassino and the breakout at Anzio leading to the capture of Rome. Allied Armies in Italy. U.S. Fifth Army. Commander: British Eighth Army (on the Winter Line). Commander: German Army Group C. Commander: Sources.