<prompt> Bhala okuqhubekayo kwalesi sigaba - Ngemva kwesikhathi esifushane njengeluthenanthi lokuqala emkhunjini omdala, kusukela ngoSepthemba 1939 kuya ku-Ephreli 1940, uGretton wamiswa ngesikhathi esifushane kakhulu njengeluthenanthi wokuqala emkhunjini omkhulu wesimanje futhi wabona isenzo eMpini Yesibili yaseNarvik  <response>: ngesikhathi seMpi YaseNorway. Wanikezwa umyalo womshayisi omdala ngo-1941 futhi wakhonza eNyakatho Atlantic. Waphakanyiselwa esikhundleni sokuba yi-lieutenant-commander ngo-1 Juni 1942, wanikezwa umyalo womshayeli omusha omusha futhi wabuyela eMedithera. Wabamba iqhaza ku-Operation Pedestal, ukusebenza kweMalta ngo-Agasti 1942, futhi wacwilisa umkhumbi-ngwenya wase-Italy Dagabur ngokushayisa. Wakhushulwa waba ngukhomanda ngomhlaka 31 Disemba 1942, wanikezwa umyalo womshayisi, njengoSenior Officer Escort kuya ku-Escort Group B7, ezinze eDerry. 