On 22 June 1779, after a short action, Ambuscade captured the French brig Hélene, which was the former Royal Navy 14-gun sloop HMS Helena. The Royal Navy took her back into service under her original name. Six days later Ambuscade captured the French privateer Prince de Montbray. The privateer was possibly out of Granville and under the command of Captain Boisnard-Maisonneuve.