The troopers dismounted, and some lay down on the ground by the horses, while two kindled a fire in the stone chimney of the cabin and made coffee for the others. Corporal Bromley leaned a bundle of red-and-white flags against the door-post, and after turning aside with Lieutenant Coleman and Philip Welton to inspect their supplies on the pack-mules, the three joined the captain and the guide in the shadow of that end of the cabin which looked toward the singular mountain standing boldly between the Cove and the valley beyond. That it was a mighty fortress, unscalable on its western side, could be seen at a glance. The broad moonlight fell full on a huge boulder, whose mighty top, a thousand feet above the Cove, was fringed with a tall forest growth that looked in the distance like stunted berry-bushes, and whose rounded granite side was streaked with black storm-stains where the rains of centuries had coursed down. The moonlight picked out white spots underneath the huge folds which here and there belted the rock and protected its under face from the storms. These were the spots which the rills dribbled over and the torrents jumped clear of to meet their old tracks on the bulging rock below. It looked for all the world as if the smoke from huge fires had been curling against the mountain for ages, so black were the broad upward streaks and so white in the moon's light were the surrounding faces of the rock. Phil was the first to speak. [Illustration: "IT WAS A MIGHTY FORTRESS, UNSCALABLE ON ITS WESTERN SIDE."] "It must have been a giant that rolled it there," he said with a sigh of relief, and looking up at Andy, the guide. "Well, now, youngster," said Andy, "you'd 'low so if you was round these parts in the springtime, when the sun loosens the big icicles hangin' on them black ledges, an' leaves 'em fall thunderin' into the Cove bottom." The Cove post-office, whose long white roof crowned a knoll nearly in the center of a small tract within the mountain walls, Andy said, was at such times a great resort of the mountaineers, who came that they might watch the movement of the avalanches of snow and ice.