I have read with interest your questions and the responses concerning the battle, etc. at Sulphur Trestle.
I also have searched for the location of grave sites for those killed in the battle. My great, great-uncle William W. Tomey lost his life as a result of the battle. His body was never returned home, but buried in the area.
From all indications, he was buried in the graveyard of the church where the wounded were taken. I have a letter from the wife of a man who cared for him (he died two days after the battle) plus there is a letter from a Capt Moorhous which states that William was put in a coffin and buried in the church yard of the church where he was taken.
I realize that in years following the war that the US government had bodies of some fallen soldiers disinterred and moved to national cemeteries. However, I've always believed that William is still buried in the church cemetery. I suppose historians in your area would know of any records proving otherwise.