"Lookout" participated in the allied occupation of Madagascar. She joined her sister ships and at Durban on 22 April 1942 and they departed on 28 April 1942, en route for Diego Suarez (now Antsiranana), with invasion transports and escort. On 7 May the three L-class destroyers escorted the battleship to search for an enemy battleship and cruisers. None were found, but "Laforey" sank an enemy submarine.