Pope’s great source of uncertainty lay in the fact that he did not know whether Lee would move against him or would follow McClellan in the latter’s retreat from the Peninsula; nor did he know when the reënforcements promised from McClellan’s army would reach him. Meanwhile Lee had decided to let McClellan depart in peace and to advance against Pope, with the whole Confederate army. To this end Longstreet was ordered to the scene and with his corps he reached Gordonsville on August 13th.
A few days later the two Confederate generals, Lee and Longstreet, ascended to the top of Clark’s Mountain, from which, through powerful field-glasses, they obtained a good view of Culpeper, about twelve miles away. They saw that Pope’s position was weak and determined to attack him without delay. Lee ordered his army to cross the Rapidan. He also sent a courier to gallop across the country with an important dispatch to General Stuart, disclosing his plans. It was now that General Pope met fortune; he captured the courier and learned of Lee’s plans. Pope knew that he was not in position to meet Lee’s army at Culpeper, and he withdrew from that place and took up a strong position behind the Rappahannock. Lee had strained every nerve to get at his antagonist before the latter left Culpeper and before he could be reënforced by McClellan’s army. But sudden rains changed the Rappahannock from a placid stream into a rushing torrent. The Confederates were delayed and meantime the reënforcements from the Peninsula began to reach Pope’s army. General Reno with a part of Burnside’s corps was on the ground by August 14th. One week later came Generals Kearny and Reynolds—both splendid leaders, both destined to give their lives for their country within a year—to join the Army of Virginia with some thousands of additional fighters from the Army of the Potomac.
Lee was completely thwarted in his purpose of attacking Pope before his reënforcements arrived. But he was not idle. He sent the dauntless cavalry leader, J. E. B. Stuart, to make a raid around the Union army. Stuart did this effectively, and this was the first of the two notable events of these weeks of sparring. Crossing the Rappahannock at Waterloo Bridge with fifteen hundred mounted men as bold and dauntless as himself, Stuart dashed up the country, riding all day and all night. After the coming of night on the evening of the 22d, in the midst of a torrential rainstorm, while the darkness was so intense that every man was guided by the tread of his brother horsemen, Stuart pounced upon the Federals near Catlett’s Station, overpowered the astonished guard, captured nearly two hundred prisoners, scattering the remainder of the troops stationed there far and wide in the darkness, and seized Pope’s despatch-book with his plans and private papers. Stuart took also several hundred fine horses and burned a large number of wagons laden with supplies. Among his trophies was a fine uniform cloak and hat which were the personal property of General Pope. These were exchanged on the following day for General Stuart’s plumed hat which a few days before had been left behind by that officer when surprised by Federal troops.
Stuart’s bold raid proved a serious misfortune for the Union army. But Lee had far greater things in store. His next move was to send Jackson to Pope’s rear with a large part of the Confederate army. Stealthily Jackson led his army westward, shielded by the woods, the thickets, and the low hills of the Blue Ridge. It was a quiet rural community through which he passed. The great majority of the simple country folk had never seen an army, though it is true that for many days the far-away boom of cannon had reached their ears from the valley of the Rapidan. Now here was a real army at their very doors. Nor was it a hostile army, for their sympathies were Southern. With baskets and armfuls of bread and pies and cakes they cheered as best they could the tattered and hungry men on the march.
General Lee in the meantime had kept Longstreet in front of Pope’s army on the Rappahannock to make daily demonstrations and feints and thus to divert Pope’s attention from Jackson’s movements and lead him to believe that he was to be attacked in front. The trick was eminently successful. “Stonewall” Jackson suddenly, on August 26th, emerged from the Bull Run Mountains by way of the Thoroughfare Gap and marshaled his clans on the plains of Manassas, but a few miles from the site of the famous battle of the year before.
Pope had taken alarm. He was astonished to find Jackson in his rear, and he had to decide instantly between two courses to abandon his communications with Fredericksburg on the one hand, or with Alexandria and Washington on the other. He decided to keep in touch with Washington at all hazards. Breaking his camp on the Rappahannock, he hastened with all speed to lead his forces toward Manassas Junction, where he had stored vast quantities of provisions and munitions of war. But he was too late to save them. Jackson had been joined by Stuart and his cavalry. On the evening of the 26th they were still some miles from Manassas and Trimble was sent ahead to make sure the capture before Pope’s army could arrive. Through the darkness rode these same hardy men who had a few nights before made their bold raid on Catlett’s Station. Before midnight they reached Manassas. They met little opposition. The guard was overpowered. The spoils of this capture were great, including three hundred prisoners, one hundred and seventy-five horses, ten locomotives, seven long trains of provisions, and vast stores and munitions of war.
Next morning the weary and hungry foot soldiers of Jackson’s army came upon the scene and whatever else they did they feasted as only hungry men can. An eye-witness wrote, “To see a starving man eating lobster-salad and drinking Rhine wine, barefooted and in tatters, was curious; the whole thing was incredible.”
The amazement at the North when the news of the capture of Manassas became known cannot be described. But the newspapers belittled it, declaring that it was merely a bold raid and that for any large force to get between Pope’s army and Washington before Pope became aware of the attempt was simply impossible.
Jackson had done an astonishing thing. But his position was precarious, nevertheless. Pope was moving toward him with a far larger army, recently augmented by Heintzelman’s corps from the Army of the Potomac, while Fitz John Porter with an additional force was not far off. It is true that Longstreet was hastening to the aid of Jackson, but he had to come by the same route which had brought Jackson—through Thoroughfare Gap—and Pope thought he saw a great opportunity. If he could only detain Longstreet at the gap, why should he not crush Jackson with his superior numbers? To this end he sent orders to Porter, to McDowell, and to Kearny and others whose forces were scattered about the country, to concentrate during the night of the 27th and move upon Jackson. McDowell sent Ricketts with a small force—too small to prevent Longstreet from passing through Thoroughfare Gap, and hastened to join the main army against Jackson. But that able commander was not to be caught in a trap. He moved from Manassas Junction by three roads toward the old battle-field of Bull Run and by noon on the 28th the whole corps was once more united between Centreville and Sudley Spring. Late in the day he encountered King’s division of McDowell’s corps near the village of Groveton, and a sharp fight was opened and kept up till an hour after dark. The Confederates were left in possession of the field.
The following day, August 29th, was the first of the two days’ battle, leaving out of account the fight of the evening before and the desultory fighting of the preceding ten days. General Pope was still hopeful of crushing Jackson before the arrival of Longstreet, and on the morning of the 29th he ordered a general advance across Bull Run. As the noon hour approached a wild shout that arose from Jackson’s men told too well of the arrival of Longstreet. Far away on the hills near Gainesville could be seen the marching columns of Longstreet, who had passed through the gap in safety and who was now rushing to the support of Jackson. The Confederate army was at last to be reunited. Jackson was greatly relieved. Pope had lost his opportunity of fighting the army of his opponent in sections.