Willam Mowbray was listed in the archives as being Master and Commander of HMS Swift.
William died on 18 December 1812. A note states that he was ‘received for interment’ from the Royal Navy Hospital. A Mowbray genealogy states that the family bible lists William as having succumbed to a fever. He lies somewhere within the Royal Navy Burial Ground in Halifax.
HM Store Ship Swift, “in 1812 she was under the command of Mr. W. Moubray, master. She then sailed to Halifax” (wikipedia).
Nova Scotia History 