U-1231

Type

IXC/40

Ordered

14 Oct 1941

Laid down

31 Mar 1943

Deutsche Werft AG, Hamburg (werk 394)

Launched

18 Nov 1943

Commissioned

9 Feb 1944

Kapt. z. S. Hermann Lessing

Commanders

9 Feb 1944	-	Mar, 1945		Kpt. Hermann Lessing
Mar, 1945	-	13 May 1945		Oblt. Helmut Wicke

Career
2 patrols

9 Feb 1944	-	31 Aug 1944	31. Flottille (training)
1 Sep 1944	-	30 Sep 1944	11. Flottille (active service)
1 Oct 1944	-	8 May 1945	33. Flottille (active service)

Successes

No ships sunk or damaged

Fate

Surrendered on 13 May 1945 at Loch Eriboll, Scotland (Waller & Niestlé, 2010).

Post war information (see more post-war boats):
Allocated to the USSR by the TNC. Arrived Libau (Latvia) on 4 Dec 45 with RN Pennant No: N.26. Allocated to the Baltic Fleet on 13 Feb 46. Renamed B-26 on 9 Jun 49. To reserve on 17 Aug 53. Designated as combat training hulk KBP-33 on 15 Sep 52. Re-designated, as training hulk UTS-23 on 27 Dec 56. Struck from Soviet Navy list on 13 Jan 68. Broken-up for scrap in Riga (Latvia).

Final location

View the 2 war patrols

Previously recorded fate

Surrendered at Lough Foyle (Lisahally), Northern Ireland on 14 May, 1945.

Men lost from U-boats

Unlike many other U-boats, which during their service lost men due to accidents and various other causes, U-1231 did not suffer any casualties (we know of) until the time of her loss.