Warner Mifflin--energetic, uncompromising, and reviled--was the key figure connecting the abolitionist movements before and after the American Revolution. A descendant of one of the pioneering families of William Penn's "Holy Experiment," Mifflin upheld the Quaker pacifist doctrine, carrying the peace testimony to Generals Howe and Washington across the blood-soaked Germantown battlefield and traveling several thousand miles by horse up and down the Atlantic seaboard to stiffen the spines of the beleaguered Quakers, harried and exiled for their neutrality during the war for independence....