Beallsville is an unincorporated community in Montgomery County, Maryland. It is a small community outside of Poolesville, Maryland.
In the latter part of 1861 Union soldiers were encamped in the small town of Beallsville Maryland, known at the time as Monocacy Church. The 1748 Anglican "Chapel of Ease" from which the town acquired its name was nearly destroyed by the Union occupation. Beallsville was a crossroads on the road from Rockvilleto the Monocacy River and Nolands ferry, making it a strategic spot for the Union.As part of the Maryland Campaign, in September 1862, Illinois, Indiana and Virginia cavalry met in Beallsville after becoming engaged the day before in Poolesville. The engagement resulted in two Virginian dead, and the capture of their captain and six other enlisted men.On October 12, 1862, a second cavalry battle occurred in Beallsville. As part of Gen. J.E.B. Stuart's second ride around the Army of the Potomac, Stuart was returning to White's Ford and confronted by Federal forces based out of Beallsville a mile north of the Chapel. Confederate artillery held the Federal troops and Stuart was able to cross the Potomac.After the war the E.V. White Chapter of the United Daughters of the Confederacy rebuilt Monocacy Church in the Monocacy cemetery. A celebration commemorating the birthday of Jefferson Davis was held every June 3 at the cemetery.