This is the first Civil War soldier I've found in my family tree for either North or South.  My third great grandfather George Marion Gunter seems to have been a sergeant in the Confederate Army.  He was part of a regiment with a lot of Cherokee Indian members called Thomas' Legion.  "George was a 4th Sgt.in the G,Infantry Regiment of the Thomas Legion during the Civil War,he enlisted on July 19,1862."-per this source.

For context on this regiment see:  https://en.wikipedia.org/wiki/Thomas%27_Legion. Here's his tombstone, note the inscription "A Rebel Soldier."