The following Union Army units and commanders fought in the Battle of Ball's Bluff of the American Civil War, fought from October 20 to October 24, 1861, in Loudoun County, Virginia, also known as the Battle of Leesburg or the Battle of Harrison's Island. The Confederate order of battle is shown separately. Abbreviations used Military rank MG = Major General BG = Brigadier General Col = Colonel Ltc = Lieutenant Colonel Maj = Major Cpt = Captain Lt = Lieutenant Bvt = Brevet Rank Other w = wounded mw = mortally wounded k = killed Union Forces Around Ball’s Bluff and Edwards’ Ferry Army of the Potomac MG George B. McClellan (not present) Corps of Observation BG Charles Pomeroy Stone References Notes American Civil War orders of battle Loudoun County in the American Civil War