In May 1940, Trident in Kors fjord Norway, destroyed a German supply ship with a torpedo, having forced it aground in an initial gun action. She spent the period from 1941 to mid 1943 in the North Sea, where she sank the German merchants Edmund Hugo Stinnes 4, Ostpreußen, Donau II, Hödur and Bahia Laura, the German tanker Stedingen and the German auxiliary submarine chaser UJ 1213 / Rau IV. She also attacked and damaged the German merchants Cläre Hugo Stinnes and Levante, and unsuccessfully attacked the German merchants Palime, Wandsbek, Pelikan and Altkirch, the German oiler Dithmarschen, the German hospital shipBirka, the German minesweeper depot ship MRS 3 / Bali and the. Whilst returning to base at Polyarnoe, Russia, Trident was fired upon but missed by the. Perhaps her most important targets were the and, which she sighted off Norway on 23 February 1942. Trident fired seven torpedoes against them, one of which hit Prinz Eugen in the stern and jammed her rudder and damaged her engines, but the Admiral Scheer escaped unscathed. During much of this time the submarine had a young reindeer doe on board. It had been presented as a gift by the Russians in August 1941 as part of the diplomatic ceremonies to honour the alliance between Russia and Britain. The Reindeer was named Pollyanna after the base and apparently adapted well to life on board. When the submarine returned to the UK Pollyanna had grown to the extent that the services of the local slaughterman had to be used to truss her securely so she could be safely removed from the boat. Pollyanna then proceeded to live out the rest of her days in the local zoo.
Mediterranean
In 1943, Trident was assigned to operate in the Mediterranean. She sank five sailing vessels and damaged the Italian merchant Vesta and the German patrol vessel GA 41 / Tassia Christa, and attacked the German auxiliary submarine chaser UJ 2202. She was unlucky on numerous occasions, however, her torpedoes missing two submarines, the Italian merchant Agnani and the French passenger/cargo ship Cap Corse. She did not spend long in the Mediterranean before being reassigned to the Pacific far east, arriving there in mid 1943.
Far East
She spent the last part of her wartime career in operations against the Japanese, sinking a Japanese sailing vessel and landing craft and unsuccessfully attacking the Japanese training cruiser. The landing craft was attacked and sunk by her deck gun on 19 June 1945 off the Batu islands, Indonesia.
Post war
HMS Trident survived the war, and was sold for scrap on 17 February 1946, and was broken up by Cashmore, of Newport.
