Wolfpacks U-91 was part of
U-91 operated with the following Wolfpacks during its career:
Vorwärts (25 Aug 1942 - 26 Sep 1942)
Natter (6 Nov 1942 - 8 Nov 1942)
Westwall (8 Nov 1942 - 12 Dec 1942)
Knappen (19 Feb 1943 - 25 Feb 1943)
Burggraf (4 Mar 1943 - 5 Mar 1943)
Raubgraf (7 Mar 1943 - 17 Mar 1943)
Without name (5 May 1943 - 10 May 1943)
Lech (10 May 1943 - 15 May 1943)
Donau 2 (15 May 1943 - 26 May 1943)
Rossbach (6 Oct 1943 - 9 Oct 1943)
Schlieffen (14 Oct 1943 - 22 Oct 1943)
Siegfried (22 Oct 1943 - 27 Oct 1943)
Igel 2 (3 Feb 1944 - 17 Feb 1944)
Hai 1 (17 Feb 1944 - 22 Feb 1944)
Preussen (22 Feb 1944 - 26 Feb 1944)