eye of a hawk. Three hours passed, and just as they were nearing the top of the plateau, the leader suddenly stopped. With uplifted hand to enjoin silence, he turned into the dense forest at the side of the path and dismounted. Bert and Tom followed suit.

"I smell smoke," Melton whispered. "There's a campfire not far off."

And as a vagrant breeze strayed toward them, the boys, too, sniffed the unmistakable odor of smoke.

"Of course," went on Melton in a low tone, "it's no sure thing that this comes from the camp of the fellows we're after. But all the chances lie that way. We'll tie our horses here and go ahead on foot. See that your guns are handy and don't step on any loose twigs."

A moment later and the bronchos were securely tied, and, silent as ghosts, they crept up the woodland path.

CHAPTER IV

THE CAPTURED SENTRY

They had wormed their way through the thick undergrowth for perhaps three hundred feet, when Melton, who was in the van, paused abruptly and gave a sign of caution. Then he beckoned the boys to come nearer.

"They've got a sentry posted here," he whispered, "I'd hoped they'd be too careless or too drunk to do it. Look over there a little to the right."

They peered through the bushes and saw, sitting on a tree stump, a Mexican, carrying a carbine, slung in the hollow of his arm. His back was toward them at the moment, but even while they gazed, he lazily rose and turned around, so that they caught a full view of his face. It was a rascally face that left no doubt in their minds that he was one of the bandit crew. A long knife was thrust in his belt, and he looked like an ugly customer to tackle in a fight. His small, piglike eyes looked listlessly about, and then, seeing no sign of danger, he reseated h