Welcome to Ox Hill (Chantilly) Battlefield Park – Fairfax County’s only major Civil War battlefield. We invite you to enjoy the park, its interpretive trail, and other battlefield points of interest beyond the park while you explore this app. • Use this GPS-enabled mobile tour to discover notable points of interest at and nearby Ox Hill Battlefield Park. • Uncover the history of the Battle of Ox Hill – also known as the Battle of Chantilly – which was fought in the late afternoon on September