U-203 under Rolf Mützelburg patrolled New England 4 days in April 1942 without sinking ships there, later killed while diving off sub October 12, 2015March 7, 2017 Updated October 12, 2015by Eric Wiberg
U-106 under Hermann Rasch spent 7 days off New England Jan/Feb 1942 but sank nothing September 27, 2015March 7, 2017 Updated September 27, 2015by Eric Wiberg