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.