It was not for long; in another moment his face was raised from earth, his hands resumed their places on the rifle, his forefinger sought the trigger; mind, heart and eyes were clear, conscience and reason sound. He could not hope to capture that enemy; to alarm him would but send him dashing to his camp with his fatal news. The duty of the soldier was plain: the man must be shot dead from ambush--without warning, without a moment's spiritual preparation, with never so much as an unspoken prayer, he must be sent to his account. But no--there is a hope; he may have discovered nothing; perhaps he is but admiring the sublimity of the landscape. If permitted, he may turn and ride carelessly away in the direction whence he came. Surely it will be possible to judge at the instant of his withdrawing whether he knows. It may well be that his fixity of attention---Druse turned his head and looked through the deeps of air downward as from the surface of the bottom of a translucent sea. He saw creeping across the green meadow a sinuous line of figures of men and horses--some foolish commander was permitting the soldiers of his escort to water their beasts in the open, in plain view from a hundred summits! Druse withdrew his eyes from the valley and fixed them again upon the group of man and horse in the sky, and again it was through the sights of his rifle. But this time his aim was at the horse. In his memory, as if they were a divine mandate, rang the words of his father at their parting: "Whatever may occur, do what you conceive to be your duty." He was calm now. His teeth were firmly but not rigidly closed; his nerves were as tranquil as a sleeping babe's--not a tremor affected any muscle of his body; his breathing, until suspended in the act of taking aim, was regular and slow. Duty had conquered; the spirit had said to the body: "Peace, be still." He fired. An officer of the Federal force, who, in a spirit of adventure or in quest of knowledge, had left the hidden bivouac in the valley, and, with aimless feet, had made his way to the lower edge of a small open space near the foot of the cliff, was considering what he had to gain by pushing his exploration further. At a distance of a quarter-mile before him, but apparently at a stone's throw, rose from its fringe of pines the gigantic face of rock, towering to so great a height above him that it made him giddy to look up to where its edge cut a sharp, rugged line against the sky. At some distance away to his right it presented a clean, vertical profile against a background of blue sky to a point half the way down, and of distant hills hardly less blue, thence to the tops of the trees at its base. Lifting his eyes to the dizzy altitude of its summit, the officer saw an astonishing sight--a man on horseback riding down into the valley through the air!