On 28 August 1942, in the company of American warships and the corvettes and , "Oakville" was escorting a convoy off Haïti when she attacked . The submarine, which had been on the point of attacking the convoy, was first spotted and bombarded by an American seaplane. Oakville dropped depth charges to force it to surface, and after bombarding it, rammed the submarine twice, sustaining minor damages to its hull. The submarine, struck by a depth charge on the surface, gave up the fight. A boarding party was dispatched to seize the vessel.