Stealing gently to the side of Carlos, the half-blood shook the sleeper by the arm. A slight shake was enough, for in an instant the cibolero was upon his feet and handling his rifle. He always resorted to this weapon in cases of danger, such as a hostile attack by Indians, using his bow only in the chase.

After a word or two had passed between Carlos and Antonio the three peons were awaked, and all five stood to their arms. The little party remained in the midst of the carretas, which had been drawn up so as to form a small triangular corral. The high boxes of these would be an excellent protection against arrows; and, as there was no fire in the camp to make a light, they could not be seen from without. The camp, moreover, was shadowed by the thick foliage of the mulberries, which rendered it still more obscure; while its occupants commanded a view of the prairie in front. But for the wood copses which stood at intervals, they could have seen the whole ground both up and down the valley and along its sides. These copses, however, might have concealed any number of foes.

The hunters remained silent, listening intently. At one time they fancied they could see a dark form crouching along the ground in the direction of the mulada, that was picketed not a hundred yards off. The light, however, was so uncertain, not one of the five could be sure of this. Whatever it was, it moved very slowly, for it appeared to remain near the same spot.

Carlos at length set himself to observe it more closely. He stole out from the corral, and, followed by Antonio, crawled along the ground. When the two had got nearer the dark object, it was distinctly seen to move.

“There is something!” whispered the cibolero.

At that moment the mules again snorted, and one or two of them struck the ground with their hoofs, as if startled.

“It must be a bear, I fancy,” continued Carlos. “It has the appearance of one. It will stampede the animals—a shot will be less likely to do so.”

As he said this he raised his rifle, and, taking aim as well as the darkness would allow him, pulled trigger and fired.

It seemed as if the shot had invoked all the demons of the infernal regions. A hundred voices burst forth in one simultaneous yell, the hoofs of a hundred horses rang upon the turf, the mulada got into motion, the mules squealing and plunging violently, and the next moment every one of them had broken their lariats, and were running at a furious gallop out of the valley! A dark band of yelling horsemen was seen closing in after and driving them off; and, before Carlos could recover from his surprise, both mules and Indians had disappeared out of sight and hearing!

Not a single one remained of the whole mulada. The ground upon which they had been picketed was swept perfectly clear!