You may be referring to Thomas J Abercrombie, Capt of Co "I", 19th Georgia Regiment. He commanded a detachment sent to garrison Fort Sumter in December 1863. Don't know where he is buried.

A marker for Pvt James Abercrombie of the same company and regiment can be found in Carroll County GA -
http://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GSln=Abercrombie&GSbyrel=all&GSdy=1940&GSdyrel=before&GSst=12&GScnty=404&GScntry=4&GSob=n&GRid=14055804&df=all&