HMS Fidelity was sunk by torpedoes during a U Boat attack (U435) on the 30th December 1942 off the Azores. The U-boat reported a large number of survivors on rafts and in the water. All drowned in the rough seas as the weather deteriorated. The only survivors were a few who had launched a motor boat from the ship before the attack. Among the casualties were 53 members of 'T' Company 40 RM Commando who were on board. The letter 'T' was never used again by 40RM Commando for a Company.
All Casualties are listed by the CWGC as dying on the 1st January 1943.