Hiram and Levi were brothers, originally from Lawrence County, TN, who served in the same Arkansas regiment. Their brother, William, who served in the 54th Tennessee Infantry, was my gr-gr-grandfather. I have both Levi's and Hiram's military records from the National Archives.
The brothers both went to the Northwest after the war. Hiram died in Coquille, Oregon, in 1905; Levi in Folsom, California, in 1915.