Benajah Osmun was born in Hunterdon County, New Jersey in 17XX. He served in the Revolutionary War as a 2nd Lieutenant and Quartermaster. He was captured at Charleston in 1778 and exchanged. A Captain by brevet and served to the end of the war. He was an original member of the New Jersey Chapter of the Society of the Cincinnati. A prominate group of revolutionary war veterans
Osmun and another Federalist Lemuel Henry posted sureties on the $10,000 bond posted to guarantee Aaron Burr. Appearance before a special section of the Territorial Supreme Court.
Figure 3 Founders Online, National Archives https://founders.archives.gov/documents/Adams/99-02-020- 2224
Source: Trip Through The Piney Woods, PDF p. 101.