Desert Gold by Zane Grey

BLANCO SOL showed no inclination to bend his head to the alfalfa which swished softly about his legs. Gale felt the horse's sensitive, almost human alertness. Sol knew as well as his master the nature of that flight.

At the far corner of the field Yaqui halted, and slowly the line of white horses merged into a compact mass. There was a trail here leading down to the river. The campfires were so close that the bright blazes could be seen in movement, and dark forms crossed in front of them. Yaqui slipped out of his saddle. He ran his hand over Diablo's nose and spoke low, and repeated this action for each of the other horses. Gale had long ceased to question the strange Indian's behavior. There was no explaining or understanding many of his manoeuvers. But the results of them were always thought-provoking. Gale had never seen horse stand so silently as in this instance; no stamp -- no champ of bit -- no toss of head -- no shake of saddle or pack -- no heave or snort! It seemed they had become imbued with the spirit of the Indian.