Then occurred that insane panic in the Federal army which has never been explained or accounted for except upon the insufficient ground that its victims were men without discipline and wholly unused to war. The explanation leaves much to be desired. The men who yielded to that panic impulse had already on that day proved themselves brave fellows, quite capable of doing soldiers' work right gallantly. They had fought with vigor, determination and high courage through long and bloody hours. They had been the assailants where assault required a greater courage than defense and they had done their soldierly work altogether well. They had been baffled of victory in the crowning hour of the battle, but they perfectly knew that their columns still outnumbered those of their adversary, and they must have known that in an orderly withdrawal from the scene of the conflict they were not in the least degree likely to be destructively assailed in their turn. Nothing was more unlikely indeed, than that the Confederates, having exhausted their freshness of vigor in the battle and having achieved their immediate purpose by repelling their enemy's assault, would in their turn advance upon that enemy, still outnumbering them, if he had withdrawn in good order and taken up a strong defensive position at Centreville, only a few miles away. Had the Federal Army done that, preserving its cohesion and presenting a determined front, it is indeed certain that the Confederates would not have cared to convert their successful defense into a more than doubtful offense; and even had that happened through Confederate over-confidence, the opportunity of the Federals to convert their own defeat into a conspicuous victory would have been as tempting as any that an army could desire. Later in the war after the two armies had been molded into effectiveness by the stern discipline of service, some such course as this would undoubtedly have been pursued. But at Manassas the event was startlingly different. No sooner did the Federal troops that had fought so gallantly on the right of their line find their assault repelled and themselves forced back than all cohesion, all discipline, all soldierly qualities went out of them. They broke ranks and fled in a positively demented panic, which unfortunately proved to be instantly and universally contagious. The whole army fell into confusion. Even those parts of it which had successfully held their own in severe conflicts throughout the battle hours broke ranks and ran as an unorganized mob might at the advance of a force of regulars armed with bayonets. The Confederates, flushed with unexpected victory achieved in the moment of defeat, pursued them with all the quick-moving forces available, chief among these being Stuart's small body of Virginia cavalry.