Thoroughly as Mosby had been whipped on this occasion, and diminished as was his command, it was not long before he was again heard from. It must be confessed that he possessed remarkable recuperative powers. His qualities of heart and mind seemed to attach his men to him peculiarly, while his mode of warfare was calling many young and daring Virginians to his standard. By this means his numbers were soon recruited, and he was again on the rampage. At this time the government was sending supplies to the army on the Rappahannock _via_ the Orange and Alexandria Railroad. Each train was in charge of a guard, and all the principal bridges and exposed places on the route were under pickets. Besides this, frequent patrols were sent from one picket post to the other, so that the entire road was under a close surveillance. One morning, between seven and eight o'clock, the cavalry pickets and reserves about Catlett's Station were startled by artillery firing just below them on the railroad. A train laden with rations and forage had just passed on its way to the Rappahannock. It was soon ascertained that during the night the guerillas had carefully unfastened one of the rails in the woods, and by means of a wire attached to it and extended to some distance from the road, in a manner to be unobserved by the patrols, a man concealed behind a tree had drawn the rail out of place just as the engine was approaching it, throwing it off the track. A mountain howitzer, which had been placed in position, immediately plunged a shell through the engine, and at the same time a charge was made upon the guard. This consisted mostly of men whose term of service expired that very day, and their resistance amounted to nothing. They soon fled in shameful confusion, leaving the ground to the Rebels, who, after taking such plunder as they could carry, fired the train, and then started on the road to Haymarket. But the cavalry had been aroused, and detachments of the First Vermont and Fifth New York, each in separate routes, commenced a vigorous pursuit. Mosby, who commanded in person, evidently had not reckoned on so sudden and sharp an encounter. He had not proceeded two miles before he espied the boys in blue eagerly flying after him. His howitzer was quickly brought into position, and a shell was accurately thrown among his pursuers, suddenly dismounting one of the officers, whose horse was killed. But the detention of the column was only temporary, the boys being determined once more to cross sabres with the chivalry. The nature of the ground was unfavorable for a cavalry charge, and the enemy showed no disposition to fight, but fled as rapidly as possible, firing an occasional shell, but without inflicting any injury. Eagerly the boys spurred on their chargers, and were soon joined by the Vermonters, who added fresh excitement to the chase.