On the same day, as Mose was lying on the point of a grassy mesa, watching the sheep swarming about a water hole in the valley below, he saw a cloud of dust rising far up to the north. While he wondered, he heard a wild, rumbling, trampling sound. Could it be a herd of buffalo? His blood thrilled with the hope of it. His sheep were forgotten as the roar increased and wild yells came faintly to his ears. As he jerked his revolver from its holder, around the end of the mesa a herd of wild horses swept, swift as antelope, with tails streaming, with eyes flashing, and behind them, urging them on, whooping, yelling, shooting, came a band of cowboys, their arms flopping, their kerchiefs streaming. A gasping shout arose from below. "The sheep! the sheep!" Mose turned and saw the other herders rushing for their horses. He realized then the danger to the flock. The horses were sweeping like a railway train straight down upon the gray, dusty, hot river of woolly flesh. Mose shuddered with horror and pity--a moment later and the drove, led by a powerful and vicious brown mare, drove like a wedge straight into the helpless herd, and, leaping, plunging, kicking, stumbling, the powerful and swift little bronchos crossed, careering on down the valley, leaving hundreds of dead, wounded, and mangled sheep in their path. The cowboys swept on after them with exultant whooping, firing their revolvers at the Mexican herders, who stood in a daze over their torn and mangled herd. When Mose recovered from his stupefaction, his own horse was galloping in circles, his picket rope dragging, and the boss herder was swearing with a belated malignity which was ludicrous. He swept together into one steady outpour all the native and alien oaths he had ever heard in a long and eventful career among profane persons. When Mose recovered his horse and rode up to him, Jose was still swearing. He was walking among the wounded sheep, shooting those which he considered helplessly injured. His mouth was dry, his voice husky, and on his lips foam lay in yellow flecks. He ceased to imprecate only when, by repetition, his oaths became too inexpressive to be worth while. Mose's heart was boyishly tender for any animal, and to see the gentle creatures mangled, writhing and tumbling, uttering most piteous cries, touched him so deeply that he wept. He had no inclination to swear until afterward, when the full knowledge that it was a trick and not an accident came to him. He started at once for the camp to carry the black news. Delmar did not swear when Mose told him what had happened. He saddled his horse, and, buckling his revolvers about him said, "Come on, youngster; I'm going over to see about this."