The northern part of Loudoun County was a Unionist enclave in Confederate Virginia that remained a contested battleground for armies and factions of all stripes throughout the Civil War. Lying between the Blue Ridge Mountains, Harpers Ferry, and Washington, D.C., the Loudoun Valley provided a natural corridor for commanders on both sides, while its mountainous fringes were home to partisans, guerillas, deserters and smugglers. This military history examines the conflicting loyalties in the farming communities, the peaceful Quakers caught in the middle, and the political underpinnings of Unionist Virginia.