The U-boat had earlier torpedoed the 5,196 GRT steamer Aymeric claiming the lives of 53 men .
Aymeric is the last British cargo ship in the Atlantic to be sunk that month .
The U-boat had earlier torpedoed the 5,196 GRT steamer Aymeric , the last British cargo ship in the Atlantic to be sunk that month , claiming the lives of 53 men .