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| U-230 | Type VIIC |
| Feldpost Number | M 49 209 |
| Construction Yard | F.Krupp Germaniawerft AG, Kiel-Gaarden |
| Yard Number | 660 |
| Ordered | 7th Dec 1940 |
| Keel laid | 25th Nov 1941 |
| Launched | 10th Sep 1942 |
| Commissioned | 24th Oct 1942 |
| Baubelehrung | 1.KLA, Kiel | | Training, Flotillas and Duties | | 10.42 - 02.43 | 5.U-Flottille, Kiel Ausbildungsboot (under training)
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| 02.43 - 11.43 | 9.U-Flottille, Brest Frontboot (operational)
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| 12.43 - 08.44 | 29.U-Flottille, Toulon Frontboot (operational)
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| Commanders | | 10.42 - 08.44 | OL Paul Siegmann see also: U-612 U-2507 |
| 08.44 - 08.44 | OL Heinz-Eugen Eberbach see also: U-967 |
| Operations information for U-230 | 04.02.1943 - 09.02.1943 First Sailing
U-230 left Kiel under the command of Paul Siegmann on 4th Feb 1943 and arrived at Bergen on 9th Feb 1943 after five days.
| 11.02.1943 - 31.03.1943 Second Sailing - active patrol
On the 11th Feb 1943, U-230 left Bergen under the command of Paul Siegmann and after nearly seven weeks arrived at Brest on 31st Mar 1943.
Paul Siegmann hit one ship on this patrol from convoy SC-121.-
On 7th Mar 1943 he sank the British 2,868 ton Egyptian, sailing with convoy SC-121.
| 24.04.1943 - 24.05.1943 Third Sailing - active patrol
U-230 departed under Paul Siegmann from Brest on 24th Apr 1943 and arrived back at Brest on 24th May 1943 after over four weeks on patrol. At 1040 HRS on 7th May 1943 in square CF 34, U-230 came under attack from an aircraft of USAAF 2 Squadron. At 1207 HRS on 7th May 1943 in square CF 36, U-230 came under attack from an aircraft of USAAF 2 Squadron. At 0920 HRS on 12th May 1943 in square BD 68, U-230 came under attack from an aircraft of FAA 811 Squadron. The aircraft was destroyed during the attack. At 1431 HRS on 12th May 1943 in square BD 66, U-230 came under attack from an unidentified aircraft. At 1424 HRS on 21st May 1943 in square BF 44, U-230 came under attack from an aircraft of RAF 10 OTU Squadron. At 1748 HRS on 21st May 1943 in square BF 44, U-230 came under attack from an aircraft of RAF 10 OTU Squadron.
| 05.07.1943 - 08.09.1943 Fourth Sailing - active patrol
U-230 left Brest under the command of Paul Siegmann on 5th Jul 1943 and returned over nine weeks later to Brest on 8th Sep 1943.
| 22.11.1943 - 16.12.1943 Fifth Sailing - active patrol
On the 22nd Nov 1943, U-230 left Brest under the command of Paul Siegmann and arrived at Toulon on 16th Dec 1943 after three and a half weeks.
| 19.01.1944 - 24.02.1944 Sixth Sailing - active patrol
U-230 departed under Paul Siegmann from Toulon on 19th Jan 1944 and after just over five weeks arrived at La Spezia on 24th Feb 1944.
Paul Siegmann hit two ships on this patrol and both of them were in convoy, both of them were from convoy Shingle.-
On 16th Feb 1944 he sank the British 1,625 ton HMS LST-418, a member of convoy Shingle.
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On 20th Feb 1944 he sank the British 1,625 ton HMS LST-305, part of convoy Shingle.
| 06.04.1944 - 09.04.1944 Seventh Sailing
U-230 left La Spezia under the command of Paul Siegmann on 6th Apr 1944 and arrived at Toulon on 9th Apr 1944 after three days.
| 11.04.1944 - 21.05.1944 Eighth Sailing - active patrol
On the 11th Apr 1944, U-230 left Toulon under the command of Paul Siegmann and after more than five weeks arrived at La Spezia on 21st May 1944.
Paul Siegmann hit one ship on this patrol.-
On 9th May 1944 he sank the American 335 ton USS PC-558.
| 27.06.1944 - 30.06.1944 Ninth Sailing - active patrol
U-230 departed under Paul Siegmann from La Spezia on 27th Jun 1944 and arrived at Toulon on 30th Jun 1944 after three days.
| 17.08.1944 - 21.08.1944 Tenth Sailing - active patrol
U-230 left Toulon under the command of Heinz-Eugen Eberbach on 17th Aug 1944. The boat was sunk on 21st Aug 1944.
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| | | We have extra information on 4 relevant ships here:
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 | | OL Paul Siegmann | | Courtesy Thierry Nicolo |
| | OL.Ing Helmut Friedrich | | Courtesy Thierry Nicolo |
| | OLzS Heinz Riedel | | Courtesy Thierry Nicolo |
| | OLzS Herbert A Werner | | Courtesy Thierry Nicolo |
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