"Then the quicker we skip the better," were the aide-de-camp's words. "Get us to Reno fast as you can, Dean. Strike for the road again as soon as we're well beyond their buffalo. Now for it! There's something behind all this bogus hunt business, and Folsom knows what it is." And every mile of the way, until thick darkness settled down over the prairie, there was something behind the trooper cavalcade--several somethings--wary red men, young and wiry, who never let themselves be seen, yet followed on over wave after wave of prairie to look to it that no man went back from that column to carry the news of their presence to the little battalion left in charge of the new post at Warrior Gap. It was the dark of the moon, or, as the Indians say, "the nights the moon is sleeping in his lodge," and by ten P. M. the skies were overcast. Only here and there a twinkling star was visible, and only where some trooper struck a light for his pipe could a hand be seen in front of the face. The ambulance mules that had kept their steady jog during the late afternoon and the long gloaming that followed still seemed able to maintain the gait, and even the big, lumbering wagon at the rear came briskly on under the tug of its triple span, but in the intense darkness the guides at the head of the column kept losing the road, and the bumping of the wagons would reveal the fact, and a halt would be ordered, men would dismount and go bending and crouching and feeling their way over the almost barren surface, hunting among the sage brush for the double furrow of the trail. Matches innumerable were consumed, and minutes of valuable time, and the quartermaster waxed fretful and impatient, and swore that his mules could find their way where the troopers couldn't, and finally, after the trail had been lost and found half a dozen times, old Brooks was badgered into telling Dean to let the ambulance take the lead. The driver shirked at once. "There's no tellin' where we'll fetch up," said he. "Those mules can't see the trail if a man can't. Take their harness off and turn 'em loose, an' I suppose they can find their way to the post, but sure as you turn them loose when they've got somethin' on 'em, or behind 'em, and the doggone cussedness of the creatures will prompt them to smash things." But the quartermaster said he'd tried it with those very mules, between Emory and Medicine Bow a dozen times, and he'd risk it. The driver could get off his seat if he wanted to, and run alongside, but he'd stay where he was. "Let me out, please," said the engineer, and jumped to the ground, and then the cavalcade pushed on again. The driver, as ordered by an employer whom he dare not disobey, let the reins drop on the mules' backs, the troopers falling behind, the yellow ambulance and the big baggage wagon bringing up the rear.