It was now almost sundown, and the men in the column, choked and thirsty, weary beyond expression, could hardly believe the news was true. They were soon satisfied, though, that it was; but it was not for an hour yet, when twilight was beginning to gather, that they learned the real cause of their present safety. The Indians would have been upon them before night set in, had they not first discovered the nature of the dust cloud to the south-west, or rather who it was raised by. The field-glass of the Texan, even miles and miles away, had detected the flutter of cavalry guidons amid the dust, and showed that mounted troops were near enough to come to the aid of the Black Hill men before they could be crushed and their scalps taken. So, much against his will, Persimmon Bill was obliged to slacken his pace, and soon to turn his course, so, as by a night march, to put his warriors beyond the reach of those who might turn on them. When night fell, Chichester, joined by two companies of cavalry, bound for the Hills, under orders to join forces already on the way by another route, moved slowly to a camping-ground in the timber, for which he had been heading hours back. The horses of the troops were weak from scant forage, and the commanding officer did not feel it his duty to wear them out chasing Indians, though he held himself ready to protect the mining party as long as they remained with him. And they were just too willing to go on with such an escort, even with the loss of all the pack animals left on their trail; and had Persimmon Bill only halted, instead of falling back, he would have found that there was no danger of pursuit. Chichester and Crawford, when they compared notes, and found not a man of their party lost, though half its property was gone, felt satisfied that it was no worse, for at one time it seemed to both that nothing was left to them but to sell their lives as dearly as they could. In a well-guarded camp all were settled before the moon rose, and never was rest more needed by animals and men. CHAPTER XVIII. ON THE DEATH-TRAIL. Bivouacked on the treeless plain, so far from the old trail and from the timber ahead that they could see no sign of the Black Hillers or the troops, the next morning's sun rose on the band of Sioux led by Persimmon Bill. Used to all kinds of exigencies, the red men did not mind either a lack of food or of water for so short a time. They were only angered with the thought that those whom they had deemed an easy prey had escaped them. As soon as it was light, Persimmon Bill had the captured pack-horses examined, and it was found that several of them were laden with provisions. Others had ammunition and stores, and on some of them were found kegs of liquor.