In August 1941, Britain and the Soviet Union invaded Iran, with the sloop in charge of the landings at Khorramshahr, carrying two companies of the 3/10th Baluch Regiment. She was accompanied by the "Yarra" and the "Investigator". During this mission, Krishnan's tug was to standby and assist if necessary. The jetty had four gunboats, one of which started firing at the tug. Krishnan brought his ship alongside the gunboat and boarded it. The ship was captured after a brief firefight. Twenty prisoners were captured and three were killed. Khorramshahr was captured and the Iranian sloop sunk and two Iranian gunboats captured.