For Senor Buck Johnson lived just north of that terra incognita filled with the mystery of a double chance of death from man or the flaming desert known as the Mexican border. There, by natural gravitation, gathered all the desperate characters of three States and two republics. He who rode into it took good care that no one should ride behind him, lived warily, slept light, and breathed deep when once he had again sighted the familiar peaks of Cochise's Stronghold. No one professed knowledge of those who dwelt therein. They moved, mysterious as the desert illusions that compassed them about. As you rode, the ranges of mountains visibly changed form, the monstrous, snaky, sea-like growths of the cactus clutched at your stirrup, mock lakes sparkled and dissolved in the middle distance, the sun beat hot and merciless, the powdered dry alkali beat hotly and mercilessly back--and strange, grim men, swarthy, bearded, heavily armed, with red-rimmed unshifting eyes, rode silently out of the mists of illusion to look on you steadily, and then to ride silently back into the desert haze. They might be only the herders of the gaunt cattle, or again they might belong to the Lost Legion that peopled the country. All you could know was that of the men who entered in, but few returned. Directly north of this unknown land you encountered parallel fences running across the country. They enclosed nothing, but offered a check to the cattle drifting toward the clutch of the renegades, and an obstacle to swift, dashing forays. Of cattle-rustling there are various forms. The boldest consists quite simply of running off a bunch of stock, hustling it over the Mexican line, and there selling it to some of the big Sonora ranch owners. Generally this sort means war. Also are there subtler means, grading in skill from the re-branding through a wet blanket, through the crafty refashioning of a brand to the various methods of separating the cow from her unbranded calf. In the course of his task Senor Buck Johnson would have to do with them all, but at present he existed in a state of warfare, fighting an enemy who stole as the Indians used to steal. Already he had fought two pitched battles and had won them both. His cattle increased, and he became rich. Nevertheless he knew that constantly his resources were being drained. Time and again he and his new Texas foreman, Jed Parker, had followed the trail of a stampeded bunch of twenty or thirty, followed them on down through the Soda Springs Valley to the cut drift fences, there to abandon them. For, as yet, an armed force would be needed to penetrate the borderland. Once he and his men bad experienced the glory of a night pursuit. Then, at the drift fences, he had fought one of his battles. But it was impossible adequately to patrol all parts of a range bigger than some Eastern States.