<prompt> Pedzisa mutsara unotevera: Pashure penguva pfupi somutungamiri mukuru muparadzi wekare, kubva muna September 1939 kusvika muna April 1940, Gretton akagadzwa nokukurumidza zvikuru somutungamiri mukuru muparadzi mukuru wemazuva ano uye akaona chiito pa  <response>: Hondo yechipiri yeNarvik munguva yeNorway Campaign. Akapiwa basa rokutungamirira muparadzi wekare muna 1941 uye akashanda muNorth Atlantic. Akakwidziridzwa kuva lieutenant-commander musi wa 1 June 1942, akapiwa kutungamira kwechitsva chitsva uye akadzokera kuMediterranean. Akatora chikamu muOperation Pedestal, kushanda kweMalta convoy munaAugust 1942, uye akanyudza ngarava yeItaly Dagabur nekurova. Akakwidziridzwa kuva mutungamiri musi wa 31 December 1942, akapiwa mutungamiri wemuparadzi, seMukuru Mukuru Anotungamira kune Escort Group B7, yakavakirwa muDerry. 