Note, I corrected Blackburn's first name. It was Joseph. James H. Blackburn was a Lieutenant in the same regiment.Thanks John.
I had this all a bit confused. James H. replaced M. Quinn as 1st Lt. in Co. D, when Quinn was made Captain.
Joseph H. was not previously in the service. He was "Mustered in as Lt. Col. to date from Nov. 26, 1864. Was appointed from civil life."