She had three letters of marque issued to her: 27 November 1812 (Captain Thomas Robson); 15 February 1813 (Captain Joseph Freeman); and 27 August 1814 (Captain Wm Corken). "Sir John Sherbrooke's" primary captain was Joseph Freeman, an experienced privateer officer from Liverpool, Nova Scotia, who was a veteran who did everything in navy fashion. (Freeman was eventually buried in the Old Burying Ground (Halifax, Nova Scotia)). Freeman co-operated with the navy, which treated him with the same respect as a naval officer.