American Battlefield Trust’s map of the Battle of Second Manassas
Chinn Ridge - August 30, 1862
In the aftermath of the Fitz John Porter's failed attack on the Deep Cut on August 30, the Union Fifth Corps was in utter disarray. Making matters worse, Federal commander John Pope was still unaware that a fresh body of 28,000 Confederates under James Longstreet had arrived on the field and were poised to deliver a crushing blow to the disorganized Union left. And that is exactly what Longstreet did. In the largest simultaneous mass assault of the war, Longstreet's forces crushed the Union left flank. With daylight waning, Jackson's troops emerged from the protection of the unfinished railroad and pitched into Pope's troops on Chinn Ridge, driving them back across Bull Run. Only an effective Union rearguard action prevented a replay of the First Manassas disaster thirteen months earlier. Pope’s retreat to Centreville was precipitous, nonetheless. The next day, Lee ordered his army in pursuit. This was the decisive battle of the Northern Virginia Campaign.