By 17 August, when Allied forces entered the city of Messina, Sicily was secured. William P. Biddle, however, did not see the end of the campaign; she sailed from Scoglitti on 12 July and reached Oran on the 15th. There, she took on board German and Italian prisoners of war for transportation to the United States, departing Oran on the 22nd bound for Newport News, Virginia. Making port on 3 August, the attack transport remained in the Tidewater area only briefly before getting underway for the west coast.
