 Shortly after, "Le Tigre" managed to hunt down the U-boat that had torpedoed the merchant ship, which was then sunk by ; credit was awarded to "Le Tigre".The institution of an interlocking convoy system on the American coast and in the Caribbean Sea in mid-1942 resulted in an immediate drop in attacks in those areas.As a result of the increased coastal convoy escort system, the U-boats' attention was shifted back to the Atlantic convoys.