Пример действия американских лодок в Атлантике (взято с Uboat.net)

F.e. Gato-class subs, such as USS Gunnel, Herring, Shad, and Barb made their patrols in Atlantics/Biscay from Britain. They also participated in operation Torch. Below are some highlights about Shad's patrols from Uboat.net

events involving Shad include:
4 Jan, 1943
While on her 2nd war patrol out of Roseneath, Scotland, USS Shad (Lt.Cdr. E.J. MacGregor III) sinks the German auxiliary minesweeper M 4242 (212 BRT, former French trawler Odett II) and a barge with gunfire in the Bay of Biscay in position 43.55N, 02.42W.

26 Jan, 1943
While on her 2nd war patrol out of Roseneath, Scotland, USS Shad (Lt.Cdr. E.J. MacGregor III) torpedoes and damages the German blockade merchant (ore transport) Nordfels (1214 BRT) in the Bay of Biscay in position 43.28N, 02.59W.

12 Feb, 1943
USS Shad (Lt.Cdr. E.J. MacGregor III) ends her 2nd war patrol at Roseneath, Scotland.

7 Mar, 1943
USS Shad (Lt.Cdr. E.J. MacGregor III) departs Roseneath for her 3rd war patrol. Once again she is ordered to patrol in the Bay of Biscay.

1 Apr, 1943
Dispite the escort of 4 German destroyer USS Shad (Lt.Cdr. E.J. MacGregor III) torpedoes and damages the Italian blockade runner Pietro Orseolo in the Bay of Biscay in position 44.37N, 02.18W.

12 Apr, 1943
USS Shad (Lt.Cdr. E.J. MacGregor III) ends her 3rd war patrol at Roseneath.

7 Sep, 1943
After 2 more war patrols in European waters and an overhaul at New London, USS Shad (Lt.Cdr. E.J. MacGregor III) arrives at Pearl Harbour to join the Pacific war.