Jerry, you might want to check out the possibility that your Hiram Boyd may have served in a Kansas regiment. Quite a few men from western Arkansas enlisted in Kansas regiments which operated in that part of the State. For example, an entire company of the 2nd Kansas Cavalry was comprised of Arkansas men from Scott and Sebastian counties. The 6th Kansas Infantry was another big recruiter of Arkansans, along with some others I can't recall off the top of my head.