He was first to hear the sound, and by his restive actions to draw the attention of the fur-traders to it.

As a precautionary measure they all sprang up and stood by their horses to soothe them, but as a brook with a belt of bushes and quarter of a mile of plain intervened between their camp and the mustangs as they flew past, they had little or no trouble in restraining them.

Not so, however, with Charlie.

At the very moment that his master was congratulating himself on the supposed security of his position, he wrenched the halter from the hand of him who held it, burst through the barrier of felled trees that had been thrown round the camp, cleared the brook at a bound, and with a wild hilarious neigh resumed his old place in the ranks of the free-born mustangs of the prairie.
Little did Dick think, when the flood of horses swept past him, that his own good steed was there, rejoicing in his recovered liberty.

But Crusoe knew it.