On 14 June , Jackson served in a duel on behalf of his junior officer William Carroll as second against Jesse Benton , the brother of Thomas . On June 14 , Jackson served as a second in a duel on behalf of his junior officer William Carroll against Jesse Benton , the brother of Thomas . On June 14 , Jackson served as a second in a duel on behalf of his junior officer Jesse Benton against William Carroll , the brother of Thomas .