What began as a simple scouting mission evolved into a full-scale battle when a regiment of Union soldiers unexpectedly encountered a detachment of Confederate cavalry.

Three months after the Civil War's first important battle at Manassas in 1861, Union and Confederate armies met again near the sleepy town of Leesburg. The Confederates pushed forward and scattered the Union line. Soldiers drowned trying to escape back to Union lines on the other side of the Potomac River. A congressional investigation of the battle had long-lasting effects on the war's political and military administration. Bill Howard narrates the history of the battle as well as its thorny aftermath.