The party which went down the Yellowstone at one time split into two, Clark taking command of one division, and a sergeant of the other; they built their own canoes, some of them made out of hollowed trees, while the others were bull boats, made of buffalo hides stretched on a frame.

As before they revelled in the abundance of the game.

They marvelled at the incredible numbers of the buffalo whose incessant bellowing at this season filled the air with one continuous roar, which terrified their horses; they were astonished at the abundance and tameness of the elk; they fought their old enemies the grizzly bears; and they saw and noted many strange and wonderful beasts and birds.
The Adventure of Lewis and the Indians.
To Lewis there befell other adventures.

Once, while he was out with three men, a party of eight Blackfoot warriors joined them and suddenly made a treacherous attack upon them and strove to carry off their guns and horses.

But the wilderness veterans sprang to arms with a readiness that had become second nature.