William Thomas "Billy" Overby, a member of the Confederate guerrilla group Mosby's Rangers, lived most of his life in Sharpsburg, not far from what is today Thomas Crossroads. He was hanged on Sept. 23, 1864, in Front Royal, Va., by a band of rogue Federals. Offered freedom if he would disclose Mosby's whereabouts, Overby supposedly told his captors, minutes before the noose tightened, "Mosby will hang 10 of you for every one of us." For years those words haunted Carolyn Cary, longtime Fayette County historian. Last March she self-published "William Thomas Overby: Proud Partisan Ranger," the first biography of this...