Check out
http://www.itd.nps.gov/cwss/index.html
I did see a listing for 2 Hardemans
Alphonso was listed as Private going in and out of the war,however I did not see more info for Pvt Hardeman.
By the way, I noticed the actual site of the Battle of Griswoldville will have a memorial service at the battle site
on Saturday Nov 20th from 10-2pm. Hope this helps
Barron