Prairie Grove Battlefield State Park, Prairie Grove Arkansas. This scenic 750 acre park is one of the best preserved civil war battlefields in the south. 22,000 troops fought here in December,1862. The park features a walking tour, a driving tour with a CD guide which details the field and historically significant locations around the town of Prairie Grove (Pop. 4,300), a museum and visitor's center and several historic structures which were standing during the war.