 The Enigma code used by Field Marshal Gerd von Rundstedt, "Oberbefehlshaber" West (Supreme Commander West; OB West), commander of the Western Front, was broken by the end of March.German intelligence changed the Enigma codes right after the Allied landings of 6 June but by 17 June the Allies were again consistently able to read them.In response to the lessons learned at the disastrous Dieppe Raid, the Allies developed new technologies to help ensure the success of Overlord.