Monocacy National Battlefield is located in Frederick, Maryland. The battle that occurred on July 9, 1864, 150 years ago on what is now Monocacy National Battlefield, became known to history as “The Battle That Saved Washington”.

Monocacy National Battlefield is located in Frederick, Maryland. The battle that occurred on July 9, 1864, 150 years ago on what is now Monocacy National Battlefield, became known to history as “The Battle That Saved Washington”.