BATTLES OF AMERICA BY SEA AND LAND with Biographies of Naval and Military Commanders. Volume III
THE GREAT CIVIL WAR
by John Laird Wilson
The Battle of Ball's Bluff, also known as the Battle of Harrisons Island or the Battle of Leesburg, was fought on October 21, 1861, in Loudoun County, Virginia, as part of Union Maj. Gen. George B. McClellan's operations in Northern Virginia during the American Civil War.
While a minor engagement in comparison with the battles that would take place in years to follow, it was the second largest battle of the Eastern Theater in 1861, and in its aftermath had repercussions in the Union Army's chain of command structure and raised separation of powers issues under the United States Constitution during the war.