U-Boat Operations

U-101	Type VIIB
Feldpost Number	M 15 344
Construction Yard	F.Krupp Germaniawerft AG, Kiel-Gaarden
Yard Number	595
Ordered	15th Dec 1937
Keel laid	31st Mar 1939
Launched	13th Jan 1940
Commissioned	11th Mar 1940
Baubelehrung	Marinelehrwerkstatt, Kiel / Baubelehrung U-Boote Ostsee, Kiel
Training, Flotillas and Duties
03.40 - 02.42	7.U-Flottille, Kiel & St.Nazaire Ausbildungsboot (under training) Frontboot (operational)
02.42 - 03.42	26.U-Flottille, Pillau Ausbildungsboot (under training)
04.42 - 08.42	21.U-Flottille, Pillau Schulboot (training boat)
09.42 - 08.43	24.U-Flottille, Memel Ausbildungsboot (under training)
09.43 - 10.43	23.U-Flottille, Gotenhafen Schulboot (training boat)
Commanders
03.40 - 11.40	KL Fritz Frauenheim see also: U-21
11.40 - 12.41	KL Ernst Mengersen see also: U-18 U-143 U-607
02.41 - 05.41	OL Heinz-Ehlert Clausen see also: U-403
01.42 - 02.42	OL Karl-Heinz Marbach see also: U-29 U-28 U-953 U-3014
02.42 - 03.42	OL Friedrich-Wilhelm Bothe see also: U-5 U-447
05.42 - 09.42	OL Ernst von Witzendorff see also: U-121 U-46 U-650 U-267 U-2524 U-1007
09.42 - 10.43	OL Helmuth Münster see also: U-428 U-3501 U-3517

Operations information for U-101
29.04.1940 - 03.05.1940 First Sailing - active patrol U-101 left Kiel under the command of Fritz Frauenheim on 29th Apr 1940 and arrived at Trondheim on 3rd May 1940 after four days.
05.05.1940 - 10.05.1940 Second Sailing On the 5th May 1940, U-101 left Trondheim under the command of Fritz Frauenheim and after five days arrived at Kiel on 10th May 1940.
21.05.1940 - 25.06.1940 Third Sailing - active patrol U-101 departed under Fritz Frauenheim from Kiel on 21st May 1940 and arrived back at Kiel on 25th Jun 1940 after five weeks on patrol. Fritz Frauenheim hit seven ships on this patrol. On 30th May 1940 he sank the British 4,831 ton Stanhall. On 31st May 1940 he sank the British 5,775 ton Orangemoor. On 2nd Jun 1940 he sank the British 3,577 ton Polycarp. On 11th Jun 1940 he sank the Greek 5,820 ton Mount Hymettus. On 12th Jun 1940 he sank the British 5,250 ton Earlspark. On 14th Jun 1940 he sank the Greek 3,557 ton Antonis Georgandis. On 16th Jun 1940 he sank the British 13,212 ton Wellington Star.
09.08.1940 - 16.09.1940 Fourth Sailing - active patrol U-101 left Kiel under the command of Fritz Frauenheim on 9th Aug 1940 and after five and a half weeks arrived at Lorient on 16th Sep 1940. Fritz Frauenheim hit three ships on this patrol and all of them were in convoy: One was from convoy OA-199, one was from convoy OB-205 and one was from convoy SC-1. On 19th Aug 1940 he sank the British 4,576 ton Ampleforth, sailing with convoy OA-199. On 28th Aug 1940 he sank the Finnish 3,868 ton Elle, a member of convoy SC-1. On 1st Sep 1940 he sank the Greek 3,867 ton Efploia, part of convoy OB-205.
05.10.1940 - 24.10.1940 Fifth Sailing - active patrol On the 5th Oct 1940, U-101 left Lorient under the command of Fritz Frauenheim and arrived back at Lorient more than two weeks later on 24th Oct 1940. Fritz Frauenheim hit five ships on this patrol and all of them were in convoy: One was from convoy HX-77 and four were from convoy SC-7. On 12th Oct 1940 he sank the Canadian 5,779 ton Saint Malô, from convoy HX-77. On 18th Oct 1940 he sank the British 3,917 ton Creekirk, sailing with convoy SC-7. On 18th Oct 1940 he damaged the British 4,155 ton Blairspey, a member of convoy SC-7. On 19th Oct 1940 he sank the Dutch 1,904 ton Soesterberg, part of convoy SC-7. On 19th Oct 1940 he sank the British 2,962 ton Assyrian, from convoy SC-7.
24.11.1940 - 07.12.1940 Sixth Sailing - active patrol U-101 departed under Ernst Mengersen from Lorient on 24th Nov 1940 and returned to Lorient on 7th Dec 1940 after nearly two weeks on patrol. Ernst Mengersen hit five ships on this patrol, four of these ships were in convoy, all of them from convoy HX-90. On 30th Nov 1940 he sank the British 5,378 ton Aracataca. On 1st Dec 1940 he damaged the British 4,958 ton Loch Ranza, sailing with convoy HX-90. On 1st Dec 1940 he sank the British 8,826 ton Appalachee, a member of convoy HX-90. On 2nd Dec 1940 he sank the British 2,782 ton Kavak, part of convoy HX-90. On 2nd Dec 1940 he sank the British 5,497 ton Lady Glanely, from convoy HX-90.
23.01.1941 - 19.02.1941 Seventh Sailing - active patrol U-101 left Lorient under the command of Ernst Mengersen on 23rd Jan 1941 and arrived back at Lorient on 19th Feb 1941 after nearly four weeks on patrol. Ernst Mengersen hit two ships on this patrol and both of them were in convoy: One was from convoy OB-284 and one was from convoy SL-64. On 14th Feb 1941 he sank the British 5,462 ton Holystone, sailing with convoy OB-284. On 17th Feb 1941 he sank the British 5,237 ton Gairsoppa, a member of convoy SL-64.
24.03.1941 - 02.05.1941 Eighth Sailing - active patrol On the 24th Mar 1941, U-101 left Lorient under the command of Ernst Mengersen and returned five and a half weeks later to Lorient on 2nd May 1941.
28.05.1941 - 04.07.1941 Ninth Sailing - active patrol U-101 departed under Ernst Mengersen from Lorient on 28th May 1941 and arrived back at Lorient over five weeks later on 4th Jul 1941. Ernst Mengersen hit two ships on this patrol. On 4th Jun 1941 he sank the British 5,271 ton Trecarrell. On 9th Jun 1941 he sank the British 5,270 ton Trevarrack.
07.08.1941 - 04.09.1941 Tenth Sailing - active patrol U-101 left Lorient under the command of Ernst Mengersen on 7th Aug 1941 and after four weeks arrived at St. Nazaire on 4th Sep 1941.
04.10.1941 - 06.10.1941 Eleventh Sailing On the 4th Oct 1941, U-101 left St. Nazaire under the command of Ernst Mengersen and arrived back at St. Nazaire on 6th Oct 1941 after two days.
11.10.1941 - 16.11.1941 Twelfth Sailing - active patrol U-101 departed under Ernst Mengersen from St. Nazaire on 11th Oct 1941 and after just over five weeks arrived at Kiel on 16th Nov 1941. Ernst Mengersen hit one ship on this patrol from convoy SC-48. On 18th Oct 1941 he sank the British 1,190 ton HMS Broadwater, part of convoy SC-48.

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