WWI U-boats

UB 21

Type UB II
ShipyardBlohm & Voss, Hamburg (Werk 251)
Ordered 30 Apr 1915
Launched 26 Sep 1915
Commissioned 18 Feb 1916
Commanders
20 Feb 1916 - 26 Nov 1916 Kptlt. Ernst Hashagen (Royal House Order of Hohenzollern)
27 Nov 1916 - 9 Sep 1917 Oblt. Franz Walther
10 Sep 1917 - 28 Apr 1918 Oblt. Walter Scheffler
29 Apr 1918 - 7 Oct 1918 Bruno Mahn
Career 26 patrols
14 Apr 1916 - 1 Feb 1917 I Flotilla
1 Feb 1917 - 10 Sep 1917 II Flotilla
10 Sep 1917 - 29 Apr 1918 V Flotilla
29 Apr 1918 - 7 Oct 1918 I Flotilla
7 Oct 1918 - 11 Nov 1918 training Flotilla
Successes33 ships sunk with a total of 36,764 tons.
1 ship damaged with a total of 3,734 tons.
4 ships taken as prize with a total of 2,722 tons. (View ships hit by UB 21)
Fate 24 Nov 1918 - Surrendered. Sank off the English East coast on the way to be broken up in 1920..

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