Wolfpacks U-504 was part of
U-504 operated with the following Wolfpacks during its career:
Eisbär (25 Aug 1942 - 1 Sep 1942)
Rochen (16 Feb 1943 - 1 Mar 1943)
Tümmler (1 Mar 1943 - 22 Mar 1943)
Amsel 1 (3 May 1943 - 6 May 1943)
Elbe (7 May 1943 - 10 May 1943)
Elbe 2 (10 May 1943 - 14 May 1943)