- Monocacy National Battlefield Located in Frederick, MD TRAVEL BASICS - CAMPING - LODGING ACTIVITIES - FACILITIES - FEES/PERMITS Gambrills Mill Visitor Center peg bethany photo IN BRIEF Known as the Battle That Saved Washington , the battle of Monocacy on July 9, 1864 between 18, 000 Confederate forces under General Jubal Early, and 5, 800 Union forces under General Lew Wallace, marked the last ...www.nps.gov/mono
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