Whakakī i te rerenga e whai ake nei: I te tīmatanga o te tau 1941, ko McGrigor, he Kapene Flag,, he rangatira o Sir James Somerville, a, i uru ia ki nga Malta Convoys me etahi atu mahi i te Moana-a-Kiwa me te Mediterranean tae atu ki te Bombardment o Genoa i te Hui-tanguru 1941 me te whakangaromanga o te "Bismarck" i Mei 1941. I whakatairangahia ia ki te kaitautoko i te 8 o Hōngongoi 1941. I waenga i te 9 Mahuru 1941 me te timatanga o te 1943, ko ia te Kaiawhina o te Tumuaki o te Naval (Waea). I te mutunga o te tau 1943, i whakahau ia i te Naval Force (Force B) e hipoki ana i te hopu i te moutere Itari o Pantelleria (Operation Corkscrew) me nga mahi whai muri
Te whakaekenga o Hicily i whakawhiwhia ai ia ki te Tohu Ratonga Motuhake. I mahi ia hei Kaitiaki Tohu, Sicily, i whara ai ia, mo nga marama e toru i mua i tana whakahoutanga hei Kaitiaki Tohu, Taranto me Adriatic (i te turanga o te takutai i Alexandria) tae noa ki te mutunga o te 1943.