The task group hunted along the Atlantic sea lanes for German U-boats. On 13 March, aircraft from "Bogue" in conjunction with , and developed and attacked a promising submarine contact. At 1839 hours, the submarine surfaced in full view of the entire task group. It was immediately fired on by the attacking ships and planes from the carrier. At 1844 hours, the slid under the water, stern first. Twenty-three survivors were picked up by "Hobson" and "Haverfield". During the action, "Swenning" maintained her station in the escort screen. The task group refueled and provisioned at Casablanca from 18 to 22 March and continued their offensive patrol. The group replenished at Trinidad on 12 April and sailed to Norfolk where the escorts were detached to proceed to New York for yard availability. "Swenning" remained at New York from 20 April to 3 May when she returned to Hampton Roads to rejoin the Bogue group, now designated as task group TG 22.2. The ships sortied on 5 May on antisubmarine patrol. They called at Casablanca again to replenish from 29 May to 4 June and put to sea.