When "Woolsey" reached Gibraltar the next day, an Atlantic phase of her wartime career ended, and the Mediterranean phase began. She reported for duty with the 8th Fleet just in time to participate in the invasion of Sicily, and operations in Italian waters consumed the bulk of her time and energy during the ensuing eight months. For the Sicily assault, she drew duty as a fire-support ship for one of three sectors into which the Licata landing beaches were divided. Save for one brief round-trip voyage to Algiers in mid-July, "Woolsey" provided gunfire support for the troops operating ashore on Sicily and helped to defend Allied shipping from German air attacks. Though she appears not to have accounted for any Luftwaffe aircraft, she did succeed in destroying an enemy railroad battery with gunfire.