Peter Garner has a service file as a member of Mallett's N.C. Battalion, Camp Guards (Camp Holmes). Evidently the battalion was disbanded and members assigned to front-line units in 1864. On May 27, 1864, Congressman Smith introduced a bill to legalize Mallett's Battalion, but evidently it failed to pass.

Here are a couple of contemporary news articles mentioning Mallett's Battalion. Evidently people poked fun at members because of their camp guard duties and assignment:

http://www.rootsweb.com/~nccumber/mallet.html
http://www.rootsweb.com/~nccumber/johnson.html

I don't know what became of Garner afterwards, but you can order copies of his service file through the link below.