"Derwentdale" took part in the British invasion of Madagascar in 1942, leaving Durban, South Africa on 25 May 1942, and contributing 14 landing craft for the landings at Diego Suarez on 5 May. In November 1942, the British and Americans landed in French North Africa in Operation Torch, with "Derwentdale" taking part in the landings at Arzew near Oran in Algeria on 9 November. She later took part in the invasions of Sicily and Italy. She was damaged by bombing at Salerno and towed to the UK via Malta to be re-engined with engines from the "Denbydale". She returned to service as a tanker in 1946, her extra accommodation was used for passengers whilst freighting oil on the Trinidad to UK run. She was decommissioned on 19 May 1959 and was laid up at Rosyth.