The soldier took advantage of this moment of tranquillity to descend to the river to quench his thirst, and to bear back some of the liquid element to his fainting followers. While engaged in this duty he cast his eyes upon the scene, surveying with sullen interest the flood that cut off his escape from the fatal hovel. The mouth of the ravine was wide and scattered over with rocks and bushes, that even projected for some little space into the water, the latter vibrating up and down in a manner that proved the strength and irregularity of the current. The river was here bounded by frowning cliffs, from which, a furlong or two above, had fallen huge blocks of stone that greatly contracted its narrow channel; and among these the swollen waters surged and foamed with the greatest violence, producing that hollow roar, which was so much in keeping with the solitude of the ruin, and so proper an accompaniment to the growling thunder and the wild yells of the warriors. Below these massive obstructions, and opposite the mouth of the ravine, the channel had expanded into a pool; in which the waters might have regained their tranquillity and rolled along in peace, but for the presence of an island, which, growing up in the centre of the expanse, consolidated by the roots of a thousand willows and other trees that delight in such humid soils, and, in times of flood, covered by a raft of drift timber entangled among its trees, presented a barrier, on either side of which the current swept with speed and fury, though, as it seemed, entirely unopposed by rocks. In such a current, as Roland thought, there was nothing unusually formidable; a daring swimmer might easily make his way to the island opposite, where, if difficulties were presented by the second channel, he might as easily find shelter from enemies firing on him from the banks. He gazed again on the island, which, viewed in the gloom, revealed to his eyes only a mass of shadowy boughs, resting in peace and security. His heart beat high with hope, and he was beginning to debate the chances of success in an attempt to swim his party across the channel on the horses, when a flash of lightning, brighter than usual, disclosed the fancied island a cluster of shaking tree-tops, whose trunks as well as the soil that supported them, were buried fathoms deep in the flood. At the same moment, he heard coming on a gust that repelled and deadened for a time the louder tumult from the rocks above, other roaring sounds, indicating the existence of other rocky obstructions at the foot of the island, among which as he could now see, the same flash having shown him the strength of the current in the centre of the channel, the swimmer must be dashed, who failed to find footing on the island. "We are imprisoned, indeed," he muttered, bitterly: "Heaven itself has deserted us."