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ULTRA: British Intelligence Messages based on decoded German Signals, 1941-1945 is a microfilm copy of file copies of decrypted teleprinter messages held at the National Archives, Kew (DEFE 3), relating to operational intelligence from intercepted German and Italian radio communications, 1941-1945. These signals became known as ULTRA. The various series of the messages are of two distinct types: intercepted signals, decrypted, translated, and sent from the German Naval Section of the Admiralty's Naval Intelligence Centre in the Admiralty; and summaries of intelligence derived from such signals sent to the War Office, Air Ministry, and overseas commands. The collection includes translated messages relating to the German invasion of Yugoslavia, Greece, Apr 1941; forewarnings of the impending German invasion of Crete, May 1941; Operation CRUSADER, 8 Army operations in the Western Desert, Nov 1941-Jan 1942; German Air Force cover of Mediterranean transport operations, Nov 1941-Jan 1942; forewarnings of the advance in the Western Desert of German Armed Forces under the command of Col Gen Erwin Rommel, Aug 1941; German surface vessel and U-boat communications, Aug 1941-Feb 1942; Allied victory over German U-boats in the Atlantic, 1942-1943; the delay of 8 Army, under the command of Gen Bernard Law Montgomery, at Mersa el Brega, Libya, Dec 1942; the Allied campaign in Sicily, Jul 1943; the Italian surrender and the Allied landing in Italy, Sep 1943; Adolf Hitler's decision to stand on successive defensive lines in Italy, Oct 1943; forewarning of FM Albert Kesselring's decision not to advance beyond his attack at Anzio, Italy, Feb 1944; and collected intercepts which identified the German divisions manning the coastal defences in the Pas de Calais, France, Jun 1944.