The place is in Prairie Grove, AR, southwest of Fayetteville.It is called Prairie Grove Battlefield State Park. The site was the farm of Rev. Andrew "Uncle Buck" Buchanan in the early 1800s.A Cumberland Presbyterian Church (established by Buchanan) and cemetery are adjacent to the State Park.
There is a fine museum and several restored buildings that are maintained by the state.I was able to see photographs of ancestors hanging in the museum.Perhaps you will be able to find the information that you are looking for.
Bill Hunt Natchitoches, Louisiana firstname.lastname@example.org