Peter-Ottmar Grau served as Kommandant "U 46", Kommandant "U 601", Kommandant "U-872", and Kommandant "U 3015". in a total of seven sails he sank trhee ships with a total tonnage of 8.819BRT.
00.00.1938-00.09.1939: "M 1201"
01.04.1939: promoted to Oberleutnant zur See
00.10.1939-00.01.1941: Kdt, "M 1204"
00.09.1941-00.10.1941: Kdt-Schüler, U 201: 1 patrol, 17 days (6 boats)
00.10.1941-00.11.1941: Kdt, U 46
00.12.1941-00.10.1943: Kdt, U 601: 7 patrols 191 days (4 boats)
01.01.1942: promoted to Kapitänleutnant - RDA 01.01.1942
00.02.1944-00.07.1944: Kdt, U 872
00.12.1944-00.05.1945: Kdt, U 3015
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