The citation from the London Gazette dated 2 November 1943 reads:-

"Flying Officer Trigg of 200 Squadron, RAF, rendered outstanding service on convoy, escort and anti-submarine duties. He completed 46 operational sorties and invariably displayed skill and courage of a very high order.

On 11 August 1943, Flying Officer Trigg undertook, as captain and pilot, a patrol in a Liberator bomber, although he had not previously made any operational sorties in this type of aircraft. After searching for eight hours, the Liberator sighted a surfaced U-boat. Flying Officer Trigg immediately prepared to attack.

During the approach the aircraft received many hits from the submarine's anti-aircraft guns and burst into flames which quickly enveloped the tail. The moment was critical. Flying Officer Trigg could have broken off the engagement and made a forced landing in the sea, but if he continued the attack the aircraft would present a no-deflection target to deadly anti-aircraft fire and every second spent in the air would increase the extent and intensity of the flames and diminish his chances of survival.

There could have been no hesitation or doubt in his mind. He maintained his course in spite of the already precarious condition of his aircraft and executed a masterly attack. Skimming over the U-boat at less than 50 feet, with anti-aircraft fire entering his opened bomb doors, Flying Officer Trigg dropped his bombs on and around the U-boat, where they exploded with devastating effect. A short distance further on the Liberator dived into the sea with her gallant captain and crew. The U-boat sank within 20 minutes and some of the crew were picked up later in a rubber dinghy that had broken loose from the Liberator.

The Battle of the Atlantic has yielded many fine stories of air attacks on underwater craft, but Flying Officer Trigg's exploit stands out as an epic of grim determination and high courage."