The roster for the 12th Alabama Infantry does not show a J. H. Marris, the only one with that surname is William Marris, and that is
crossfiled to William Morris. But, we show a:

J H. Morris

Enlisted as a Private
"G" Co. AL 12th Infantry

Sources used by Historical Data Systems, Inc.:
- Index to Compiled Confederate Military Service Records
(c) Historical Data Systems, Inc. @ www.civilwardata.com

..............

John H. Morris, Private, Company G, 12th Alabama Infantry,
admitted 3rd Division, (formerly Small Pox Hospital), General Hospital, Howard's Grove, Richmond, Va., June 27, 1864, receipted for an issue of clothing from the Surgeon in charge, returned to duty June 29, no other records

M311: Compiled Service Records of Confederate Soldiers Who Served in Organizations from the State of Alabama