Family tradition holds that Comfort Barnum served in the Revolutionary War. No evidence has been found to document that contention, although his brother Ephraim was a captain in the 16th Connecticut Regiment (Colonel Bradley). The US Census of 1790 shows Comfort Barnham, with two other free white males of 16 years and upward, one free white male of 16 years or under and four free white females, living in Ballstown, Albany County, New York.
Comfort Barnum pledged allegiance to the British Crown in Redding, Connecticut, prior to the American Revolution and moved his family from Fairfield County, Connecticut, to New York.
He took his family from the Ballston area of New York State to Ontario, Canada after the Revolution, settling in Seymour Township in Northumberland County and later in Hastings County. His son Leman appears in the 1790's as a witness to a wedding in the Bath area of Ontario.