How a daring Confederate flanking maneuver turned the tide at Second Manassas in 1862
In August 1862, Robert E. Lee executed a high-stakes gamble to destroy Union forces in Virginia. By splitting his army and sending Stonewall Jackson on a wide-ranging march to sever supply lines, Lee forced a decisive confrontation that culminated in the largest mass assault of the American Civil War.
Following the failure of the Peninsula campaign in June 1862, President Abraham Lincoln appointed John Pope to lead the newly formed Army of Virginia. Lincoln sought a more aggressive commander than George B. McClellan, tasking Pope with protecting Washington and the Shenandoah Valley. However, Robert E. Lee, commanding the Army of Northern Virginia, recognized that the Union forces were split and widely separated. Lee seized this opportunity to strike Pope before he could consolidate his strength with reinforcements arriving from McClellan’s army.
The campaign reached its climax in late August 1862. Lee dispatched Stonewall Jackson to execute a flanking maneuver, which successfully captured the Union supply depot at Manassas Junction on August 27. This forced Pope to abandon his defensive line along the Rappahannock River. Jackson then took up a strong, concealed position behind an unfinished railroad grade near the site of the First Battle of Bull Run. Pope, convinced he had trapped Jackson, launched repeated assaults on August 29, all of which were repulsed with heavy casualties.
The battle turned on August 30 when Pope, seemingly unaware that James Longstreet’s wing of 25,000 men had arrived to reinforce Jackson, renewed his attacks. After massed Confederate artillery devastated a Union assault led by Fitz John Porter, Longstreet launched a massive counterattack. This simultaneous assault by five divisions crushed the Union left flank, driving the army back toward Bull Run. Only a desperate rear guard action prevented a total collapse similar to the defeat at First Manassas. This victory emboldened Lee to initiate the subsequent Maryland campaign, marking a significant shift in the war's momentum.
The scale of the conflict was immense, with Union forces numbering approximately 77,000 against 55,000 Confederates. The strategic success of the Confederate wings uniting on the battlefield, facilitated by the Battle of Thoroughfare Gap on August 28, proved decisive. By effectively cutting Pope’s communications and forcing him into a precipitous retreat to Centreville, Lee demonstrated the power of aggressive maneuver warfare, fundamentally altering the strategic landscape of the American Civil War.
Source: Second Battle of Bull Run
