 "Trenchant" under her captain Commander Arthur Hezlet, DSO, DSC acted in the Far East mostly off South East Asia against Japanese shipping sinking a range of vessels both transports and warships, using her torpedoes, gun and also by ramming.She often operated in company with her sister, HMS "Terrapin".On 23 September 1944 she sank the German submarine U-859 in the Straits of Malacca, by torpedoes.