Desert Gold by Zane Grey

RICHARD GALE reflected that his sojourn in the West had been what his disgusted father had predicted -- idling here and there, with no objective point or purpose.

It was reflection such as this, only more serious and perhaps somewhat desperate, that had brought Gale down to the border. For some time the newspapers had been printing news of Mexican revolution, guerrilla warfare, United States cavalry patrolling the international line, American cowboys fighting with the rebels, and wild stories of bold raiders and bandits. But as opportunity, and adventure, too, had apparently given him a wide berth in Montana, Wyoming, Colorado, he had struck southwest for the Arizona border, where he hoped to see some stirring life. He did not care very much what happened. Months of futile wandering in the hope of finding a place where he fitted had inclined Richard to his father's opinion.