"Seer" continued to escort merchant ship and amphibious convoys to Italy into the summer of 1944 when she joined the forces assigned to Operation "Dragoon," the landings in southern France. Departing Naples on 12 August, she moved toward the French coast; and, during the pre-dawn hours of the 15th, commenced sweeping the boat lanes leading to "Red Beach" on the Baie de Cavalaire. Further sweeping operations in the assault area and off Toulon and Marseille followed; and, for almost a month, she escaped damage from German mines and coastal guns. On 10 September, however, she struck a moored contact mine in the Rade d'Hyères. Three were killed, 20 injured. Hull and engine damage was severe.