When Gregory P. Wilson began researching his family history, he never expected to uncover an ancestor as unique and fascinating as Jonathan Roberts. A devout Quaker, Roberts wore many hats throughout his life. He was a farmer, surveyor, husband, and father. He also was a firm abolitionist, the Civil War's Quaker scout and sheriff in northern Virginia. Roberts's noncombatant military service began shortly after his secessionist neighbors tried to kill him for his political and antislavery views. Fleeing his Fairfax County home after Confederate General P.G.T. Beauregard ordered his arrest, Roberts volunteered his surveying experience to the Union's Army of the Potomac, guiding troops to and from First Manassas (Bull Run). Over the course of the war, he was injured twice, once seriously while chasing John Singleton Mosby, the "Gray Ghost" of the Confederacy. When not delivering military dispatches, guiding troops, or scouting in the midst of cavalry charges, Roberts served as Fairfax County's twice-elected sheriff, responsible for everything from tax collections to murders. Wilson, like all who experience Roberts's story, can only marvel at his formidable ancestor's adventures and wonder if the outspoken Quaker appreciated the many ironies and contradictions of his remarkable life.