The chance came shortly before sundown. A distant shot was heard, and the two Mexicans in the cave hurried to join their companions, to learn what it might mean. Dan had cast himself down as if asleep, and one of the soldiers did not, therefore, pick up his gun as he hurried past the entrance of the cave. No sooner were the men out of sight, than Dan leaped upon the back of the nearest mustang, and turned him straight for the entrance. He made the animal do his best from the start, yet, as he passed the entrance to the cave, he hung out from the saddle and managed to pick up the gun that rested against the wall. "He is escaping!" cried one of the Mexicans, in Spanish, and leaped in front of the mustang. The next instant the horse knocked him flat and galloped over his body. The Mexicans were bewildered, for, on the brink of the ravine, one of them had caught sight of several Texan soldiers in the distance. If they fired on Dan, they would betray themselves, and, if they did not, the youth would surely escape. "After him!" cried the captain, and two of the soldiers made a dash for the boy. But they might have as well tried to catch the wind, for the mustang was fresh from his rest, and Dan made him do his level best. Then along the ravine sped animal and boy, Dan riding as never before, and expecting a shot at any moment. He knew not where he was going, and hardly cared, so long as he made his escape from the Mexicans. CHAPTER XX. FLIGHT AND PURSUIT. Lieutenant Radbury's party had come up to the ravine at a point opposite to the cave, about half an hour before Dan attempted to make his escape. "I see nothing of the Mexicans here," he remarked to Poke Stover, as he swept the ravine from one end to the other with his well-trained eye. "No more do I see anything," answered the old frontiersman. "But they may be behind yonder rocks, leftenant. If ye say the word, I'll climb down and scout around a bit." "There is a cave among yonder rocks," put in another of the Texans. "It is called Haunted Rock by the Indians. The Comanches used to use it as a meeting-place when they were out for plunder. I've often heard old Si Bilkens tell about it." "I have heard of such a cave," answered Amos Radbury. "If the Mexicans knew of it, they might think it just the right sort of a hiding-place. Yes, Poke, you can scout around. But be careful. They may be watching for a shot." The frontiersman nodded, to show that he understood, and went off immediately on foot, it being impossible to go down the ravine's side on mustang-back, no matter how sure-footed the animal might be. The descent into the ravine took time, and Poke Stover was still some distance from the cave's entrance when he heard a commotion among the bushes and rocks. "A mustang a-comin' this way," he muttered to himself. "And somebody ridin', too. It must be one of them dirty greasers trying to git away. I'll cut him short."