"Somers" next participated in the invasion of Normandy as a convoy escort and, in August, the Southern France invasion, providing naval gunfire support as well as serving in the anti-submarine screen. On 15 August 1944, four hours before H-Hour, D-Day, along the French Riviera, "Somers" encountered and sank the German corvette "UJ6081" and the sloop "SG21" at the Battle of Port Cros. Following this action, she moved inshore to give gunfire support to the invasion. For two days she bombarded enemy strongpoints off the coast near Toulon with 5 inch (127 mm) shells and then exchanged fire with enemy shore batteries east of Marseilles. "Somers" sustained some damage during this action.