When it did, important ships based in Dakar were obtained: the modern battleship Richelieu, the heavy cruiser Suffren, light cruisers Gloire, Montcalm, Georges Leygues, and a few destroyers, including cruiser-sized Le Fantasque class destroyers.
While on patrol in the Atlantic with the destroyers, Le Fantasque and Le Terrible, she intercepted and captured the German freighter Santa Fé, on 25 October 1939, On 14 June 1940, Dupleix participated in the French raid on Genoa, with sister ships Foch and Colbert.