HMS TROOPER (Lt J S Wraith) sailed from Beirut on 26 September 1943 to patrol west of the Dodecanese in the Eastern Mediterranean and later to the east of the island of Leros. No messages were received from her, and she failed to arrive back on 17 October. Her loss was considered to be due to striking an enemy mine. There were no survivors.
TROOPER was Lt Wraith second command. He had previously been a successful commanding officer of HMS UPRIGHT and had conducted a morale boosting tour of factories in the UK after leaving UPRIGHT prior to assuming command of TROOPER.