But even this night came to an end; and, with the first eastern streaks of pink and gold so exquisitely beautiful through the rarefied atmosphere of this region, the surveyors were once more in the field. There was no merriment now, nor life in the work. It went on amid a dogged silence. The transit and level were lifted slowly, as though they were made of lead. The chain was dragged wearily along at a walk. It was evident that the limit of endurance was nearly reached. Scouts were sent out on both sides to search for water. There was no use sending anybody ahead to hunt up that mirage, or at least so thought General Lyle. His maps showed the river to be miles away; but they also showed a large creek, not far to the westward; and towards this the hopes of the party were turned. On the maps it was called "Sand Creek," a name made infamous forever by a massacre of Indians, mostly women and children, that took place on its banks in November, 1864. Then it had contained water; but now it was true to its name, and the dispirited scouts, returning from it, reported that its bed was but a level expanse of dry, glistening sand.

As this report was being made, there came a quick succession of shots from the front, and a thrill of new life instantly pervaded the whole party. What could they indicate, if not good news of some kind. The first division had completed its two miles, and the second was running the line. "Billy" Brackett was preparing for one of his famous mile sights at the front flag, with which Glen Eddy, riding beside Mr. Hobart, was wearily toiling up a distant slope. Gazing at them through his fine telescope, the transit-man could not at first understand their extraordinary actions as they reached the top. He saw Glen fling up his hat, and Mr. Hobart fire his pistol into the air. Then Glen waved his flag, while the division engineer seemed to be pointing to something in front of them.

"Well, quit your fooling and give me a sight, can't you?" growled "Billy" Brackett to himself, but directly afterwards he shouted to those near him, "I believe they've found water, and shouldn't wonder if they'd located the Arkansas itself." Then he got his "sight," waved "all right," mounted his mule, shouldered the transit, and galloped away.

He was right; they had located the Arkansas, and the alleged mirage of the evening before had been a reality after all. That night of suffering had been spent within five miles of one of the largest rivers that cross the Plains.

As Glen and Mr. Hobart reached the crest of that long slope they saw its grassy valley outspread before them. They saw the scattered timber lining its banks, and, best of all, they saw the broad, brown flood itself, rolling down to join the distant Mississippi. By shots and wavings they tried to communicate the joyful intelligence to those who toiled so wearily behind them, and "Billy" Brackett, watching them through his transit, had understood.

They waited on the ridge until he joined them, and then hastened away towards the tempting river. When the next foresight was taken Glen's flag was planted on the edge of that famous old wagon-road of the Arkansas Valley known to generations of Plainsmen as the Santa Fé Trail.

Glen had hardly waved his "all right" to the transit, before the wagons came tearing down the slope with their mules on the keen run. The perishing animals had seen the life-giving waters, and it was with the greatest difficulty that they were restrained from rushing into the river, wagons and all. The drivers only just succeeded in casting loose the trace-chains, when each team, with outstretched necks and husky brayings, plunged in a body over the bank and into the river, burying their heads up to their eyes in the cooling flood. It seemed as though they would drink themselves to death, and when they finally, consented to leave the river and turn their attention to the rich grasses of its bottom-lands, they were evidently water-logged. It would be hours before they were again fit for work.

But nobody wanted them to work. Not until the next morning would the wagons move again. The splendid runs of the last three days had earned a rest for men and animals alike. So it was granted them, and no schoolboys ever enjoyed a half-holiday more. What a luxury it was to have plenty of water again, not only to drink, but actually to wash with and bathe in! And to lie in the shade of a tree! Could anything be more delicious?

At sunrise the line was resumed; and, still working together, the three divisions ran it for fifty miles up the broad valley of the Arkansas.

A few days after striking the river they passed Bent's Fort, one of the most famous of the old Plains trading-posts built by individuals long before troops were sent out to occupy the land.