"Indomitable" was detached from the Eastern Fleet to take part in the invasion, rendezvousing with the covering force (which included sister ship ) and the invasion force which had been sent from Durban, South Africa. The assault began on 5 May at Courrier Bay, just west of the actual objective of Diego Suarez. "Indomitable"s air wing attacked Arrachart airfield on the opening day of the invasion, destroying five Morane-Saulnier M.S.406 fighters and damaging two more as well as two Potez 63.11s. The following day a ground assault began, with "Indomitable"s Albacores bombing the defences and her Fulmars and Sea Hurricanes flying ground attack sorties. French forces in Diego Suarez surrendered on 7 May. On 8 May, the attempted to torpedo "Indomitable" but was sunk by depth charges from the destroyers and .