The Queen of the Savannah by Gustave Aimard

The emotion caused by the strange apparition we described in the last chapter was gradually dissipated; minds regained their equilibrium, and ere long the travellers, reassured by each other's presence, laughed and jested at the terror they had felt. Two of them, however, more obstinate, or more affected than the rest, wished to detect the meaning of this extraordinary adventure, and, as if by common accord, though they did not communicate to each other the result of their reflections, they fetched their horses, mounted, and rushed into the forest from two opposite points. These two men were Don Aurelio Gutierrez and the Canadian adventurer, known as the Sumach.

Their absence was long, and their comrades impatiently awaited their return for several hours. At length they reappeared, each coming in a direction opposed to that in which he had set out. For a radius of four leagues round the clearing, they had explored the forest, clump by clump, bush by bush, but in vain; their researches had obtained no result; they had discovered no trace, and found no sign which might lead them to the truth. At one moment the adventurer fancied that he heard the distant gallop of a horse; but the sound was so remote, so indistinct, that it was impossible for him to form any opinion or acquire a certainty. As for Don Aurelio, the forest had been as silent to him as a tomb.