The instant that it dawned upon him that Nolan and his friends were heading across country for Shiner's old plant, riding hard in the belief that they were pursued by rail, it flashed upon him that he could not join Nolan there--indeed, he must, if a possible thing, guide or direct him elsewhere. Already the pursued were through the ford and, with dripping flanks, were scrambling up the opposite shore. Already big 705 was almost abreast of them, and in another moment would be swiftly speeding by. It was two years since Geordie last set eyes on Nolan, but there was no mistaking, even at that distance, the tall, gaunt figure and the practised seat in saddle. Behind him trailed three comrades, two of whom, at least, were tyros in the art of horsemanship. They were hanging on for dear life as their steeds labored on after the leader. The object of all four was obviously to get beyond easy rifle range of the rushing train before drawing rein to reconnoitre, and now, probably noting that the engine was driving on full speed, with no sign of stopping, the tall horseman in the lead circled swiftly to his right, along the crest of a low ridge perhaps three hundred yards away, then peered from under his broad hatbrim at the supposed enemy. And then it was that Graham and Toomey, both, sprang back to the coal-pile in the tender, clambered high as possible on the shifting slope, and, balancing as best they could, whipped off their caps, swung them joyously about their heads, and eagerly gave the old-time, well-known cavalry signal, "Forward!" "Forward!" They saw Nolan and his friends seated on their panting horses, staring after them in amaze and wonderment, then resolutely following. A mile now would bring them whistling by the site of old Fort Reynolds, and a lump rose in Geordie's throat, for the weather-beaten, ramshackle stables came in view as the Mogul rounded a long, easy curve, and there, beyond them and on the level bench before them, stood the trim rows of officers' quarters, now deserted and tenantless, yet guarded by the single sergeant and his little squad of men. To the right, afar up the track near the foot-bridge and ford, lay the station building, wellnigh useless now since the greater interests and industries, that had made the railway possible and forced the Indian farther back, had also fouled the mountain stream and spoiled the site for a cavalry post. There stood the freight sheds; there were the chutes for horses and mules; there, beyond them, the now abandoned office and waiting-room; and there, still glistening white and towering, the semaphore signal-mast of the railway; and then and there, sure and sudden, there dropped the black arm straight across and above their glistening path in the never-to-be-neglected order--Stop!