Monocacy National Battlefield

Monocacy National Battlefield is a unit of the National Park Service, the site of the Battle of Monocacy in the American Civil War fought on July 9, 1864. The battlefield straddles the Monocacy River southwest of the city of Frederick, Maryland. The battle, labeled "The Battle That Saved Washington," was one of the last the Confederates would carry out in Union territory. Wikipedia*

On the C-SPAN Networks:
Monocacy National Battlefield has hosted 1 event in the C-SPAN Video Library; the first program was a 2010 Interview.