Had the guide, however, penetrated half a mile further to the west he would have come upon the cause of the panic, and a spectacle more marvelous than that he had just witnessed. For the illimitable plain with its monotonous prospect was far from being level; a hundred yards further on he would have slowly and imperceptibly descended into a depression nearly a mile in width. Here he not only would have completely lost sight of his own cavalcade, but have come upon another thrice its length. For here was a trailing line of jog-trotting dusky shapes, some crouching on dwarf ponies half their size, some trailing lances, lodge-poles, rifles, women and children after them, all moving with a monotonous rhythmic motion as marked as the military precision of the other cavalcade, and always on a parallel line with it. They had done so all day, keeping touch and distance by stealthy videttes that crept and crawled along the imperceptible slope towards the unconscious white men. It was, no doubt, the near proximity of one of those watchers that had touched the keen scent of the troopers' horses. The moon came up; the two cavalcades, scarcely a mile apart, moved on in unison together. Then suddenly the dusky caravan seemed to arise, stretch itself out, and swept away like a morning mist towards the west. The bugles of Fort Biggs had just rung out. ***** Peter Atherly was up early the next morning pacing the veranda of the commandant's house at Fort Biggs. It had been his intention to visit the new Indian Reservation that day, but he had just received a letter announcing an unexpected visit from his sister, who wished to join him. He had never told her the secret of their Indian paternity, as it had been revealed to him from the scornful lips of Gray Eagle a year ago; he knew her strangely excitable nature; besides, she was a wife now, and the secret would have to be shared with her husband. When he himself had recovered from the shock of the revelation, two things had impressed themselves upon his reserved and gloomy nature: a horror of his previous claim upon the Atherlys, and an infinite pity and sense of duty towards his own race. He had devoted himself and his increasing wealth to this one object; it seemed to him at times almost providential that his position as a legislator, which he had accepted as a whim or fancy, should have given him this singular opportunity.