Le Tonnant was rearmed on 8 April 1941 and subsequently deployed to Casablanca in July 1941 and to Dakar in November 1941. By August or September 1942, according to different sources, she was operating from Casablanca along with Le Conquérant.Huan, p. 125. As of 1 November 1942, she was part of the 4th Submarine Division at Casablanca with Le Conquérant, soon joined by their sister ship . On 6 November 1942, she was floated out of drydock at Casablanca after a minor refit.
