But suddenly one of the blacks, a big, shaggy fellow, shot up his ears and pointed his nose over the top of the fence. He whistled. Other horses looked in the same direction, and their ears went up, and they, too, whistled. Gale knew that other horses or men, very likely both, were approaching. But the Mexicans did not hear the alarm, or show any interest if they did. These mescal-drinking raiders were not scouts. It was notorious how easily they could be surprised or ambushed. Mostly they were ignorant, thick-skulled peons. They were wonderful horsemen, and could go long without food or water; but they had not other accomplishments or attributes calculated to help them in desert warfare. They had poor sight, poor hearing, poor judgment, and when excited they resembled crazed ants running wild. Gale saw two Indians on burros come riding up the other side of the knoll upon which the adobe house stood; and apparently they were not aware of the presence of the Mexicans, for they came on up the path. One Indian was a Papago. The other, striking in appearance for other reasons than that he seemed to be about to fall from the burro, Gale took to be a Yaqui. These travelers had absolutely nothing for an outfit except a blanket and a half-empty bag. They came over the knoll and down the path toward the well, turned a corner of the house, and completely surprised the raiders. Gale heard a short, shrill cry, strangely high and wild, and this came from one of the Indians. It was answered by hoarse shouts. Then the leader of the trio, the Mexican who packed a gun, pulled it and fired point-blank. He missed once--and again. At the third shot the Papago shrieked and tumbled off his burro to fall in a heap. The other Indian swayed, as if the taking away of the support lent by his comrade had brought collapse, and with the fourth shot he, too, slipped to the ground. The reports had frightened the horses in the corral; and the vicious black, crowding the rickety bars, broke them down. He came plunging out. Two of the Mexicans ran for him, catching him by nose and mane, and the third ran to block the gateway. Then, with a splendid vaulting mount, the Mexican with the gun leaped to the back of the horse. He yelled and waved his gun, and urged the black forward. The manner of all three was savagely jocose. They were having sport. The two on the ground began to dance and jabber. The mounted leader shot again, and then stuck like a leech upon the bare back of the rearing black. It was a vain show of horsemanship. Then this Mexican, by some strange grip, brought the horse down, plunging almost upon the body of the Indian that had fallen last.