WWI U-boats

UB 23

Type UB II
ShipyardBlohm & Voss, Hamburg (Werk 253)
Ordered 30 Apr 1915
Launched 9 Oct 1915
Commissioned 11 Mar 1916
Commanders
13 Mar 1916 - 9 Nov 1916 Oblt. Ernst Voigt (Royal House Order of Hohenzollern)
10 Nov 1916 - 5 Feb 1917 Oblt. Heinz Ziemer
6 Feb 1917 - 18 Feb 1917 Oblt. Herbert Lefholz
19 Feb 1917 - 19 Mar 1917 Oblt. Matthias Graf von Schmettow (Royal House Order of Hohenzollern)
20 Mar 1917 - 29 Jul 1917 Oblt. Hans Ewald Niemer
Career 21 patrols
19 May 1916 - 29 Jul 1917 Flandern Flotilla
Successes51 ships sunk with a total of 33,880 tons.
1 ship damaged with a total of 419 tons. (View ships hit by UB 23)
Fate 29 Jul 1917 - Interned at Corunna, Spain after being badly damaged by depth charges from the patrol boat HMS PC-60 off the Lizard on July 26..

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