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, U-455, joined from patrols in the Mid Atlantic.
Another two boats, U-631 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.
Schlieffen was disbanded after this attack, with a number of its boats forming the nucleus of a new group, code-named Siegfried.