On their return to Liverpool, "Starling" and 2SG were assigned to "Operation Musketry", an attempt, in concert with Coastal Command, to interdict the U-boat transit routes across the Bay of Biscay. On 24 June 1943 the group was successful in destroying two U-boats; "Starling" destroyed , but was damaged when she rammed the U-boat to dispatch it. She was forced to return to Britain for repairs, under the temporary command of Cdr. DEG Wemyss of "Wild Goose", Walker having stayed with the group.