The next day, "Tatum" reported to Naples where she embarked the commander of a landing craft convoy for the impending invasion of southern France. "Tatum" stood out of Naples on 9 August, joined the landing craft in the Gulf of Pozzuoli, and escorted them to the staging area at Ajaccio, Corsica. Before dawn on the 15th, the convoy arrived off St. Tropez where "Tatum" transferred the convoy commander to "LCI-196". She then patrolled off Cape Camarat until the following afternoon. From 17 July until early autumn, "Tatum" protected convoys shuttling between Corsica, Sardinia, and southern France. On 16 October, she departed Marseilles in the screen of a convoy bound for Bizerte and Oran. During the early part of November, "Tatum" escorted another convoy from Oran to Marseilles then screened the Army transport "Mariposa" to Naples and returned to Oran on 15 November. "Tatum" got underway again on 24 November to screen a convoy back to the United States, arriving at New York on 11 December.