...giment and acting assistant adjutant general of the cavalry brigade, was promoted to be captain of Boyd's company. Just then, General Lee slipped away from Hooker at Fredericksburg, en route for Gettysburg , and suddenly confronted Milroy at Winchester. The First New York Cavalry were at Berryville, and were compelled to retire before the advance of Rodes' Division, of Ewell's Corps. A brigade of re...