Dorothy --
It will help us to know where your ancestor's family lived in 1860. The 1850 census of Union County GA reports a Barney Casteel, age 5, living in the household of Alexander Casteel, Union County GA. The other man by this man appears on the 1860 census of McMinn County TN.
A Georgian who is buried at Mount Olivet on this date probably died of wounds in Federal hands after being captured on the slopes of South Mountain MD, Sept. 14, 1862.