She was moderately damaged during the fighting on 18 March 1915 and had to be sent to Toulon for repairs. Upon their completion the ship returned to provide gunfire support for the Allied forces during the Gallipoli Campaign. "Suffren" provided covering fire as the Allies withdrew from the peninsula and accidentally sank one of the evacuation ships. After repairs the ship was assigned to the French squadron tasked to prevent any interference by the Greeks with Allied operations on the Salonica Front. While en route to Lorient for a refit, "Suffren" was torpedoed off Lisbon by a Imperial German submarine on 26 November 1916 and sank with all hands.