Schlieffen was formed in October 1943 to operate against the North Atlantic convoy routes and comprised 14 boats. It consisted of 6 boats from the disbanded group Rossbach, plus 7 others from bases in France and Germany, while another, U-455, joined from patrol in the Mid Atlantic.
Whilst moving into position a number of boats came under attack, principally from aircraft from USS Card, which was operating against their re-fuelling operation. The tanker U-488 was attacked on 12 October, but suffered little damage; however, U-731, which was also attacked later that day, was forced to return to base. On 13 October two more boats (U-402 and U-603) were attacked, and both were destroyed. Another two boats, U-631 and U-455 collided; both were damaged, and U-455 was forced to retire to base for repairs, while U-631, with her torpedo tubes out of action, was put on observation duties.
From 15 October Schlieffen operated against convoys ONS 20 and ON 206, which were travelling together; U-boats from Schlieffen sank one ship of 6,625 GRT, but lost six boats (U-470, U-540, U-630, U-841, U-844 and U-964) in one of the most calamitous nights of the campaign for the U-boat arm (U-Bootwaffe, UBW).
Schlieffen was disbanded after this attack, with a number of its boats forming the nucleus of a new group, code-named Siegfried.
- Jak P M Showell U-Boat Warfare: The Evolution of the Wolf-Pack (2002) ISBN 0-7110-2887-7
- Clay Blair : Hitler's U-Boat War [Volume 2]: The Hunted 1942-1945 (1998) ISBN 0-304-35261-6 (2000 UK paperback ed.)
- Helgason, Guðmundur. "Wolfpack Schliefen". German U-boats of WWII - uboat.net.