 By December 1942, Enigma decrypts were again disclosing U-boat patrol positions, and shipping losses declined dramatically once more.Following the St Nazaire Raid on 28 March 1942, Raeder decided the risk of further seaborne attack was high and relocated the western command centre for U-boats to the Château de Pignerolle, where a command bunker was built and from where all Enigma radio messages between German command and Atlantic based operational U-boats were transmitted/received.In July 1942, Hans-Rudolf Rösing was appointed as FdU West ("Führer der Unterseeboote West").