Capt. William T. M. Holmes was killed in action at Davis' Bridge, Hatchie River, Mississippi, on October 5, 1862.
Lieut. Robert Hawkins Dedman served in Co. A, 3rd Arkansas Cavalry, for the entire war, starting out as a sergeant, ending up as a captain, commanding the company. He was paroled Charlotte, North Carolina, on May 31, 1865.
If you want the full names and records of the other officers who signed the petition, just let me know.