Buuxi weedhan soo socota: Horraantii 1941, McGrigor wuxuu ahaa, si kooban, Kabtan Calan,, calanka Sir James Somerville wuxuuna ku lug lahaa Malta Convoys iyo howlgallada kale ee Atlantic iyo Mediterranean oo ay ku jiraan Duqeynta Genoa bishii Febraayo 1941 iyo daadinta "Bismarck" bishii May 1941. Waxaa loo dalacsiiyay sarkaal sare oo ciidanka badda ah 8 Luulyo 1941. Intii u dhaxeysay 9 Sebtember 1941 iyo horraantii 1943, wuxuu ahaa Kaaliyaha Madaxa Ciidanka Badda (Hubka). Dabayaaqadii 1943, wuxuu amar ku bixiyay Ciidanka Badda (Ciidanka B) oo daboolaya qabsashada jasiiradda Talyaaniga ee Pantelleria (Howlgalka Corkscrew) iyo dagaalka ka dib.
Dagaalkii Sicily oo uu ku helay abaalmarinta Distinguished Service Order. Wuxuu ahaa Sarkaalka Calanka, Sicily, halkaas oo uu ku dhaawacmay, muddo saddex bilood ah ka hor inta aan dib loogu soo celin Sarkaalka Calanka, Taranto iyo Adriatic (oo fadhigiisu yahay xarunta xeebta ee Alexandria) illaa dhammaadka 1943.