Schlieffen was a wolfpack of German U-boats that operated during the battle of the Atlantic in World War II.
Schlieffen was formed in October 1943 to operate against the North Atlantic convoy routes and comprised 14 U-boats. It consisted of 6 U-boats from the disbanded group Rossbach, plus 7 others from bases in France and Germany, while another,, joined from patrols 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 was attacked on 12 October, but suffered little damage; however,, which was also attacked later that day, was forced to return to base. On 13 October two more boats (and) were attacked, and both were destroyed. Another two boats, and U-455 collided and were damaged; 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, but lost six boats (and) 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.
Schlieffen was named for Count Alfred von Schlieffen, a Prussian field marshal and strategist of the 19th century.