More than an hour had been spent thus, and he had begun to listen more attentively, and, if possible, watch more closely for signs of his enemies. He halted on the brink of a deep ravine, which furnished a channel for another small stream; and, before venturing down into its bed, stooped nearly to the ground, and remained for many minutes profoundly listening to every sound. The stillness of night was quite unbroken; and he was on the point of beginning the descent, when his eye caught the flash, as of faint lightning, playing briefly upon the leaves at the bottom of the ravine! It was gone in a moment; and his first impulse was to look up through the tree-tops at the sky. But the stars were shining serenely—there was not the slightest cloud in the heavens. He watched for a long time for its reappearance—but the darkness remained as deep as before. It might have been a fire-fly; yet it was strange that it was not repeated; and it had been, not so much a light, as a flicker, like the blaze of thin fuel, and it had died out gradually, not suddenly disappeared. While he stood irresolute, reflecting upon the singularity of the appearance, an imperfect sound, as of very distant thunder, seemed to float along the earth and die away at his feet. He placed his ear to the ground, and again listened. The stamping of numerous horses became plainly audible—and they could be but a short distance from him. To his practiced ear the sound was familiar enough—and he had no difficulty in determining its locality. He at once rose to his feet and again examined his arms. Moving cautiously and slowly, he then descended the bank until he reached the bottom of the ravine. Turning to the right, he glided silently and stealthily along its bed for two or three hundred yards, when, on coming to a bend where the stony soil had resisted the action of the elements, his progress was suddenly arrested by a stream of light which shone from beyond the projection, and cast deep shadows upon the opposite bank. The fire from which it came was evidently built within the ravine for concealment—for it was only from above that it could become visible at any considerable distance. To approach nearer in this direction would not be prudent—for, by the shadows on the bank, Edgar could see that at least twenty horses were picketed just beyond the shoulder of the ridge; and a snort from one of these might attract attention. He had no fear of other sentinels; he well understood the Indian practice of posting none; for, apparently so negligent are these most vigilant of all warriors, that even in their incursions, when they are constantly liable to attack, every man lies down to sleep, trusting solely to concealment and their Manitous for protection.