Sharpsburg (Antietam) Campaign
Here Lee entered this road from Ox Hill, September 3, 1862, and turned West toward Leesburg. Crossing the Potomac at White's Ford, the army entered Maryland, September 5-6, 1862.
Marker is on Leesburg Pike (Virginia Route 7) near Northfalls Court, on the right when traveling west.
Courtesy hmdb.org