Map showing position of Union and Rebel armies and Jackson's flank march during 2nd Battle of Bull Run, Aug. 28th to 31st, 1862.

Fortunately, Pope's forces retained control of Henry House Hill, thereby allowing the bulk of his army to retreat safely across Bull Run toward Centreville.
As part of Lee's plan to interrupt Pope's line of communications, he sent Jackson in a flank movement around the Union Army to take up a position between it and Centreville; Jackson chose the vicinity of Sudley Mountain. As the Union forces advanced toward Centreville, they were surprised to meet Jackson's men near Groveton (28 August). Pope immediately concentrated his entire force in the area, assuming they would meet only Jackson's division and land an easy victory (August 29). The first day of fighting consisted largely of delaying the Union forces until Longstreet's division could arrive as reinforcements. When on August 30 Jackson's army moved back from the positions it had reached on the day previous, Pope assumed they were in retreat, and began a full-scale assault, which was strongly repulsed. Longstreet's division, which had been waiting on Jackson's flank, now flanked the unsuspecting Federals.
This map shows an area of Fauquier and Prince William counties, Va., that includes Bealeton Station (on the Orange and Alexandria Railroad) to the southwest, the town of Warrenton to the west, and the town of Gainesville to the north.