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. 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. 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.