August 28-30, 1862
In order to draw Pope's army into battle, Jackson ordered an attack on a Federal column that was passing across his front on the Warrenton Turnpike on August 28. The fighting at Brawner Farm lasted several hours and resulted in a stalemate. Pope became convinced that he had trapped Jackson and concentrated the bulk of his army against him. On August 29, Pope launched a series of assaults against Jackson's position along an unfinished railroad grade. The attacks were repulsed with heavy casualties on both sides. At noon, Longstreet arrived on the field from Thoroughfare Gap and took position on Jackson's right flank. On August 30, Pope renewed his attacks, seemingly unaware that Longstreet was on the field. When massed Confederate artillery devastated a Union assault by Fitz John Porter's command, Longstreet's wing of 28,000 men counterattacked in the largest, simultaneous mass assault of the war. The Union left flank was crushed and the army driven back to Bull Run. Only an effective Union rearguard action prevented a replay of the First Manassas disaster. 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.
Source: American Battlefield Protection Program
Meditation on the Divine Will
September 2, 1862
The will of God prevails. In great contests each party claims to act in accordance with the will of God. Both may be, and one must be wrong. God can not be for, and against the same thing at the same time. In the present civil war it is quite possible that God's purpose is something different from the purpose of either party - and yet the human instrumentalities, working just as they do, are of the best adaptation to effect His purpose. I am almost ready to say this is probably true - that God wills this contest, and wills that it shall end yet. By his mere quiet power, on the minds of the now contestants, He could have either saved or destroyed the Union without a human contest. Yet the contest began. And having begun He could give the final victory to either side any day. Yet the contest proceeds.
Source: The Collected Works of Abraham Lincoln, Volume VI, pp. 327-368.