...battle which hung in the balance three days at Gettsyburg had rolled with the line in gray. The organization of the Thirteenth New York Cavalry was not completed till June 20, 1863, ten days before Gettysburg . Six companies left New York State for Washington on June 23d, and took their part in patrolling the rear of the Army of the Potomac during the three fateful days. They were more than raw recruit...