 Still believing their new weapons and tactics gave them an advantage, despite the losses suffered by wolfpack "Schlieffen" and unaware of the poor results achieved during its attack on convoys ONS 20 and ON 206,
Befehlshaber der Unterseeboote (BdU) re-organized the boats then in the North Atlantic into patrol line "Siegfried" to continue the offensive.The next convoy subjected to an attack was ON 207.ON 207 departed Liverpool on 18 October 1943, bound for New York.