"Good night to you," said the hunter.
"Good night," said the Little Giant, "an' remember not to kick one o' my mules in your sleep."
"I won't," replied Will, cheerfully, as he went around the curve of the wall.
He found the horses and mules at rest, and everything very quiet and peaceful in the alcove. The rill murmured a little in its stony bed, and, far overhead, he heard the wind sighing among the trees on the mountain. He chose a place close to the wall, spread two blankets there, on which he expected to lie, and prepared to cover himself with two more. He realized now that he was tired to the bone, but it was not a nervous weariness and sleep would cure it almost at once.
He was arranging the two blankets that were to cover him, when he heard a rumbling noise far over his head. At first he thought it was distant thunder echoing along the ridges, but the wisps of cloud were too light and thin to indicate any storm. He saw the horses and mules rise in alarm, and then not one but several of them gave out shrill and terrible neighs of terror, a volume of frightened sound that made young Clarke's heart stand still for a moment.
The sound which was not that of thunder, but of something rolling and crashing, increased with terrific rapidity, stopped abruptly for a moment or two and then a huge dark object shooting down in front of his eyes, struck the ground with mighty impact. It seemed to him that the earth trembled. He sprang back several feet and all the horses and mules, rearing in alarm, crouched against the cliff.
A great bowlder lay partly buried. It had rolled from the edge of the cliff high above, and he divined at once that the Sioux had made it roll. They had climbed the stony mountains enclosing the defile, and were opening a bombardment, necessarily at random, but nevertheless terrible in its nature. While he hesitated, not knowing what to do, a second bowlder thundered, bounded and crashed into the chasm. But it struck much farther away.
The Little Giant came running at the sound, leaving Boyd on guard at the mouth of the pass, and as he arrived a third rock struck, though, like the second, at a distance, and he knew without any words from Will, what the Sioux were now trying to do. As he looked up, a fourth crashed down, and it fell very near.
"So that's thar trick?" exclaimed the Little Giant. "Simple ez you please, but ez dang'rous ez a batt'ry o' cannon. Look out, young William, thar's another."
It struck so close to Will that he felt the shock and ran back to the shelter of the overhanging cliff, where, driven by instinct, the horses and mules were already crowding. Nor did the Little Giant, brave as he was, hesitate to follow him.