Leesburg, Virginia is rich in colonial and Civil War history (or War Between The States, depending on your perspective). "Beauregard Estates" is named for Fort Beauregard, which once occupied the heights of this ridge, commanding the approaches to Leesburg from what was the Colonial Road (Rt 15), the Leesburg and Alexandria Turnpike (Rt 7) and the AL&H Railroad. Fort Beauregard was one of a series of forts, constructed to protect Leesburg from Union advances across the Potomac River. Leesburg commissioned an excellent report and discussion of the defensive forts, which can be found here. Our Fort, in turn, was named in honor of Confederate General Pierre Gustave Toutant Beauregard, "hero of Charleston" and commander of Southern forces in Northern Virginia in early 1861.
Information on the flamboyant General Beauregard may be found here.
Battle of Ball's Bluff
While Union and Confederate forces frequented the Leesburg area repeatedly during the course of the war, the most significant action in this area was the Battle of Ball's Bluff. Fought on October 21, 1861 just north and east of Fort Beauregard. The 8th Virginia Infantry Regiment featured prominantly in the battle, a unit composed of local Loudoun, Fairfax, Fauquier, and Prince William men. The cross river raid gone wrong ended in a rout of Union forces, and the death of a sitting U.S. Senator.
More information on the battle may be found here.