BA-MA, N 328/45, Ehrhardt an Förste; Ludovic Kennedy, Pursuit: Battleship Bismarck (London, 1993), p. 35; BA-MA, N 379/109a, 12.09.1956; BA-MA, Pers 6/2236, Personalbogen, Frau: Margarete Backenköhler geb. 09.05.1903, Bl. 2; BA-MA, 656/2, Bl. 13; discussion with Dr. G. Granier on 12.11.1997 in the Bundesarchiv-Militärarchiv about Backenköhler’s Jewish past. Interestingly, as the Bismarck was in its death throes, Lütjens sent a radiogram to Hitler praising the Führer and the war. Perhaps Lütjens did so because he ¤rmly believed in Hitler, or perhaps he was scared for his Mischling wife and children and wanted to ensure their protection by displaying his devotion. It was probably a mixture of both. Burkard Frhr. von Müllenheim-Rechberg, SchlachtschiŸ Bismarck, 1940–1941 (Berlin, 1980), pp. 168–69; Jörg Duppler, ed., Germania auf dem Meere (Hamburg, 1998), p. 127.
this is a note for book "Lives Of Hitler's Jewish Soldiers" and in index of this document there is this name Lutjens (Backenköhler) Margarete I think this is Gunter Lutjens wife and on site about film Sink the Bismarck is this txt: "In real life, Admiral Lutjens was distinctly anti-Nazi, vehemently protested the anti-Semitic actions of Hitler's regime, and was himself subject to intense Nazi scrutiny as he was a quarter Jewish and his wife was half Jewish. He was one of many German naval officers who fought only for their country, not Hitler."