Many times during the night the watchful fellow arose to replenish this fire, so that there might be no decrease in the flood of heat which entered the tent, and kept his charges comfortable. Once, while he was so engaged, the placid sleepers whom he had noiselessly quitted were aroused to terror—sudden, bewildering night-terror—by a gasping cry from his lips, followed by the leaping and rushing of some brute in flight, and by a screech which was one defiant note of unutterable savagery.