U-161 under Albrecht Achilles patrolled New England 33 days in April/May 1943, sank only the schooner Angelus October 22, 2015March 7, 2017 Updated October 22, 2015by Eric Wiberg
U-404 under Otto von Bülow spent 6 days in New England w/o sinking any Allied ships in March 1942 October 2, 2015March 7, 2017 Updated October 2, 2015by Eric Wiberg