Suddenly a dazzling ray of light flashed, for the fraction of a second, full in Glen's eyes, causing him to start, as though a pistol had been fired close beside him. He glanced hurriedly about. Not a wagon was in sight; but he knew the train must be just over the rise of ground he and Binney were ascending. At that same moment the mule threw up its head and sniffed the air uneasily. Glen's second glance was behind him, and it revealed a sight that, for an instant, stopped the beating of his heart. The whole country seemed alive with Indians.