February 1943. In the icy North Atlantic, German U-boats encircled Convoy ON-166, 63 ships hauling vital cargo from America ...
The German U-boat force maintained a fearsome reputation. But American submariners fought more effectively.
"After the fall of France in 1940, Germany attempted to strangle Britain into submission by attacking the Atlantic Convoys, which brought much need supplies and war materiel from the USA and Canada.