Jehiel was admitted as a member of the Kent Congregational Church in 1742. On one occasion he appeared before Kent Justice of the Peace John Ransom (appointed in 1752). It was charged that he, with "clubs, fists and swords," assaulted the body of Abner Kelsey, and "made him incapable of business for a long time."
He was a 2nd Lieutenant during the Indian Wars of the 1750s. From the Connecticut Historical Society Collections, Volumes VIII-IX, XI, XIII, XV-XVII, and XIX; Collections of the Connecticut Historical Society Vol 9, Campaign of 1755, Fourth Regiment - Col Elihu Chauncey "Jehiel Barnum [of Kent], Second Lieutenant."
Jehiel was included in the fourth, fifth, sixth and seventh land divisions in Kent: May 1740, May 1748, 1750 and 1752.
Jehiel was baptized in the First Congregational Church, by special ordinance.
He supposedly died from an accident of some sort.