Crew 32
15.08.1932: entered the Kriegsmarine
15.08.-07.10.1932: basic military training in the 2nd department of the standing ship division of the Baltic Sea - Stralsund
14.-21.10.1932: transferred to the training ship 'Edith'
04.11.1932: promoted to Seekadett
06.11.1932-02.01.1934: 14-month stay on board the light cruiser 'Köln'
01.01.1934: promoted to Fähnrich zur See
03.01.1934-18.04.1935: underwent a number of officer training courses at the Naval Academy at Mürwik and Kiel-Wik, including navigational training cruises on the tender 'Weser' and 'Nordsee'
19.04.-26.09.1935: transferred to the cruiser 'Königsberg'
01.09.1935: promoted to Oberfähnrich zur See
27.09.-03.12.1935: attended more training courses, including a naval artillery course
04.-14.12.1935: attended an anti U-boat defense course
15.12.1935-11.10.1936: posted to the cruiser 'Nürnberg'
01.01.1936: promoted to Leutnant zur See
15.10.1936-29.01.1937: attended various torpedo courses at the torpedo school in Flensburg
01.02.-03.04.1937: U-Fahrausbildungslehrgang
03.04.-09.1937: II. WO - 'U-35' under the command of Hans Rudolf Rösing then Hermann Michahelles
01.10.1937: promoted to Oberleutnant zur See
10.1937-03.1938: Reserve Division - II./ Flot. - Baltic Sea
03.-06.1938: FdU
06.-10.1938: I. WO - 'U-31'
10.-11.1938: Lehrgang - Artillerie Schule - Kiel-Wik
11.1938-03.1939: I. WO - 'U-26'
17.03.1939-05.08.1940: Kommandant - 'U-2'
01.01.1940 (some sources give 01.02.1940): promoted to Kapitänleutnant
06.08.-29.09.1940: 'U-73' Baubelehrung at the Bremer Vulkan ship yard - Norden U-Boote
15.03.-29.03.1940: first war patrol with 'U-2' (Kiel to Wilhelmshaven)
04.-15.04.1940: second war patrol with 'U-2' (Wilhelmshaven to Wilhelmshaven)
30.09.1940-10.09.1942: Kommandant - 'U-73'
08.02.02.03.1941: third war patrol commanding 'U-73' (Helgoland to Lorient)
25.03.-24.04.1941: fourth war patrol, attacked and sank five ships (Lorient to St. Nazaire)
03.04.1941: attacked convoy SC 26 sinking the 'Alderpool', 'Indier', 'Westpool' and 'British Viscount'
20.04.1941: sunk the British 8,570 GRT 'Empire Endurance'
20.05.-24.06.1941: 5th war patrol (St. Nazaire to St. Nazaire)
29.07.-02.08.1941: test patrol (St. Nazaire to St. Nazaire)
07.08.-07.09.1941: 6th war patrol (St. Nazaire to St. Nazaire)
11.10.-11.11.1941: 7th war patrol (St. Nazaire to St. Nazaire)
04.01.-12.02.1942: 8th war patrol (St. Nazaire to La Spezia)
02.1942: 'U-73' was heavily bombed during his first Mediterranean patrol but managed to reach La Spezia - Italy
10.-26.03.1942: 9th war patrol (La Spezia to La Spezia)
04.08.-05.09.1942: 10th and final war patrol on 'U-73' attempted an attack on convoy WS-21S of Operation Pedestal bound for Malta (La Spezia to La Spezia)
11.08.1942: made contact and fired four torpedoes at the aircraft carrier HMS 'Eagle'
12.08.1942: awarded the RK as 120th of the Kriegsmarine and 58th of the Ubootewaffe
01.10.1942-05.1944: Kommandant - 30. U-Flottille and Admiralstabsoffizier in the staff of the Admiral of the Black Sea
10.05.1944: died in an air crash near Topleț, 11km north of Orșova located 610km west of Constanţa in Romania
03.08.1944: posthumously promoted to Korvettenkapitän (RDA 01.05.1944)
As commander of U-73, Korvettenkapitän Helmut Rosenbaum is credited with the sinking of six merchantmen for a total of 35,171 gross register tons (GRT), and three warships, 'HMS Eagle' on 11 August 1942, of 22,692 long tons (23,056 tonnes), and two Motor Launches on board 'Empire Endurance'.
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