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| U-402 | Type VIIC |
| Feldpost Number | M 43 571 |
| Construction Yard | Danziger Werft AG, Danzig |
| Yard Number | 103 |
| Ordered | 23rd Sep 1939 |
| Keel laid | 22nd Apr 1940 |
| Launched | 28th Dec 1940 |
| Commissioned | 21st May 1941 |
| Baubelehrung | Baubelehrung U-Boote Ostsee, Kiel | | Training, Flotillas and Duties | | 05.41 - 10.43 | 3.U-Flottille, Kiel & La Pallice Ausbildungsboot (under training) Frontboot (operational)
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| Commanders | | 21.05.41 - 13.10.43 | KL ~ KK Paul Gustav Siegfried Frhr von Forstner see also: U-59 |
| Operations information for U-402 | 26.10.1941 - 09.12.1941 First Sailing - active patrol
U-402 left Kiel under the command of Baron Siegfried von Forstner on 26th Oct 1941 and arrived at St. Nazaire on 9th Dec 1941 after over six weeks.
| 11.01.1942 - 11.02.1942 Second Sailing - active patrol
On the 11th Jan 1942, U-402 left St. Nazaire under the command of Baron Siegfried von Forstner and returned to St. Nazaire on 11th Feb 1942 after four and a half weeks on patrol.
Baron Siegfried von Forstner hit one ship on this patrol.-
On 16th Jan 1942 he damaged the British 12,053 ton Llangibby Castle.
| 26.03.1942 - 20.05.1942 Third Sailing - active patrol
U-402 departed under Baron Siegfried von Forstner from St. Nazaire on 26th Mar 1942 and arrived back at St. Nazaire on 20th May 1942 after nearly eight weeks on patrol.
Baron Siegfried von Forstner hit three ships on this patrol, one was from convoy ON-80.-
On 13th Apr 1942 he sank the British 5,249 ton Empire Progress, sailing with convoy ON-80.
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On 30th Apr 1942 he sank the Soviet 5,284 ton Ashkhabad.
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On 2nd May 1942 he sank the American 602 ton USS Cythera.
| 16.06.1942 - 05.08.1942 Fourth Sailing - active patrol
U-402 left St. Nazaire under the command of Baron Siegfried von Forstner on 16th Jun 1942 and after just over seven weeks arrived at La Pallice on 5th Aug 1942.
| 04.10.1942 - 20.11.1942 Fifth Sailing - active patrol
On the 4th Oct 1942, U-402 left La Pallice under the command of Baron Siegfried von Forstner and arrived back at La Pallice more than six weeks later on 20th Nov 1942.
Baron Siegfried von Forstner hit five ships on this patrol and all of them were in convoy, all of them from convoy SC-107.-
On 2nd Nov 1942 he sank the British 4,558 ton Dalcroy, a member of convoy SC-107.
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On 2nd Nov 1942 he sank the Greek 4,649 ton Rinos, part of convoy SC-107.
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On 2nd Nov 1942 he sank the British 4,945 ton Empire Antelope, from convoy SC-107.
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On 2nd Nov 1942 he sank the British 5,676 ton Empire Leopard, sailing with convoy SC-107.
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On 2nd Nov 1942 he damaged the British 7,459 ton Empire Sunrise, a member of convoy SC-107.
| 14.01.1943 - 23.02.1943 Sixth Sailing - active patrol
U-402 departed under Baron Siegfried von Forstner from La Pallice on 14th Jan 1943 and returned to La Pallice on 23rd Feb 1943 after more than five weeks on patrol.
Baron Siegfried von Forstner hit seven ships on this patrol and all of them were in convoy, all of them from convoy SC-118.-
On 7th Feb 1943 he sank the British 1,571 ton Toward, part of convoy SC-118.
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On 7th Feb 1943 he sank the Greek 4,965 ton Kalliopi, from convoy SC-118.
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On 7th Feb 1943 he sank the American 6,063 ton Henry R Mallory, sailing with convoy SC-118.
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On 7th Feb 1943 he sank the American 6,625 ton Robert E Hopkins, a member of convoy SC-118.
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On 7th Feb 1943 he sank the British 8,597 ton Afrika, part of convoy SC-118.
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On 7th Feb 1943 he damaged the Norwegian 9,272 ton Daghild, from convoy SC-118.
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On 8th Feb 1943 he sank the British 4,625 ton Newton Ash, sailing with convoy SC-118.
U-402 was previously credited with the sinking of Daghild but it is now thought that U-608 actually sank her.You can read more about the Norwegian ship listed for this patrol at www.warsailors.com.
Click the link for more information on Daghild.
| 21.04.1943 - 26.05.1943 Seventh Sailing - active patrol
U-402 left La Pallice under the command of Baron Siegfried von Forstner on 21st Apr 1943 and arrived back at La Pallice on 26th May 1943 after five weeks on patrol.
Baron Siegfried von Forstner hit two ships on this patrol and both of them were in convoy, both of them were from convoy SC-129.-
On 11th May 1943 he sank the Norwegian 3,082 ton Grado, a member of convoy SC-129.
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On 11th May 1943 he sank the British 4,545 ton Antigone, part of convoy SC-129.
You can read more about the Norwegian ship listed for this patrol at www.warsailors.com.
Click the link for more information on Grado.
| 04.09.1943 - 13.10.1943 Eighth Sailing - active patrol
On the 4th Sep 1943, U-402 left La Pallice under the command of Baron Siegfried von Forstner. On the 13th Oct 1943, U-402 was sunk.
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