Tennessee placed markers for all of its regiments and batteries. These markers are basically beefed up head stones, a little taller and a little thicker but of the same shape. They then also placed monuments for each branch of service.
Artillery: Located on the Reed's Bridge road almost directly north of the Kelly Field positions.
Carnes' Tennessee Battery. Apparently they wanted more than just a plain marker. Their marker can be seen to the left of the monument.
FYI that's me in the orange hat.
Infantry: Located along the Snodgrass Hill defenses.