The overhaul readied Lorraine to participate in Operation Dragoon, the Allied invasion of southern France in August 1944. On 15 August, Lorraine joined the bombardment force, Task Force 86, that supported landings. She and the American battleship hammered German defenses in and around Toulon, including 340 mm coastal guns that had been removed from Provence. The bombardment lasted until 21 August. Over the course of 1–13 September, Lorraine, four cruisers, and two destroyers shelled German defenses throughout the French Riviera. Among the targets Lorraine attacked were fortresses at Sospel and Castillon, along with Axis positions around Carqueiranne and Saint-Tropez. Lorraine left the bombardment area on 17 September, but remained in the western Mediterranean until she was sent to Portsmouth for a brief refit toward the end of the year. She was then sent to Cherbourg in December.
