Kilpatrick, having assembled his immortalized division on the plain at the foot of Round Top, on the morning of the fourth, discoursed to them eloquently for a few moments on the interests of the times. He assured his men that their noble deeds were not passing by unnoticed, nor would be unrequited, and that they were already a part of a grand history. He trusted that their future conduct would be a fair copy of the past. But his pathetic and patriotic accents had scarcely died upon the ear of his brave command, when the shrill bugle-blast brought eager men and grazing horses in line of march. Orders had been received by Kilpatrick to repair as swiftly as possible to the passes in the Catoctin Mountains, to intercept the enemy now known to be flying southward at a rapid rate.
The command had gone but a short distance when rain began to fall in torrents, as is usually the case after great battles, especially when much artillery is used. But through mud, in places to the horses' bodies; through brooks swollen enormously, and through the falling floods, the troopers pressed forward to the accomplishment of their task. About five o'clock P. M. Kilpatrick reached Emmitsburg, where he was joined by portions of General Gregg's command, including the Harris Light, which had been kept mostly in reserve during the conflicts of the past few days. Thus reënforced, this intrepid leader marched directly toward the Monterey Pass, arriving at the foot of this rocky defile in the mountains in the midst of pitchy darkness.
As was anticipated, a heavy Rebel train was then trying to make its escape through the gorge, guarded by Stuart's Cavalry, with light artillery. This artillery was planted in a position to rake the narrow road upon which Kilpatrick was advancing. But the darkness was so intense that the guns could be of little use, except to make the night terribly hideous with their bellowings, the echoes of which reverberated in the mountain gorges in a most frightful manner. To add to the horrors of the scene and position, the rain fell in floods, accompanied with groaning thunders, while lightnings flashed from cloud to cloud over our heads, and cleft the darkness only to leave friend and foe enveloped in greater darkness in the intervals of light. By these flashes, however, we gained a momentary glimpse of each other's position, and as we dashed forward in the gloom, we were further directed by the fire of the artillery and the desultory fire of the cavalry.