Resupplying and fueling at Portland and Plymouth, "McCook" continued to operate in the invasion area until 14 July. Four days later she was en route to Bizerte screening a convoy of LSTs and infantry landing craft. She delivered her charges on 28 July and steamed to Mers-el-Kebir, where she remained until 4 August. She then sailed to Naples to join the forces assembling for Operation Anvil, the invasion of southern France. On 13 August she sailed for France, arriving on 14 August to take up a screening position south of Toulon. For the next 35 days she remained in the assault area providing gunfire support and screen protection to the Allied combatants and to the supply and reinforcement convoys from Corsica and Naples.