Four days later, TG 22.3 reached the Naval Air Base at Argentia, Newfoundland, for a brief period of in-port upkeep. The group subsequently resumed hunter-killer operations soon thereafter; and, during the ensuing patrols, "Willis" obtained a sonar contact at 1147 on 14 September. She fired a pattern of "hedgehogs" and made two depth charge runs before she laid a sonobuoy pattern. "Swenning" joined the search at 1600, and the two destroyer escorts made a coordinated attack. "Willis" and her sistership then combed the area thoroughly throughout the night but finally gave up the hunt at 1906 the following day.