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There were great numbers of the argalea, or bighorned animals, in the high country through which it passes, and of beaver in its waters.

Just above the entrance of it we saw the ashes of the fires of one hundred and twenty-six lodges, which appeared to have been deserted about twelve or fifteen days." Leaving Judith's River, named for a sweet Virginia lass, the explorers sailed, or were towed, seventeen miles up the river, where they camped at the mouth of a bold, running river to which they gave the name of Slaughter River.

The stream is now known as the Arrow; the appropriateness of the title conferred on the stream by Lewis and Clark appears from the story which they tell of their experience just below "Slaughter River," as follows: "On the north we passed a precipice about one hundred and twenty feet high, under which lay scattered the fragments of at least one hundred carcasses of buffaloes, although the water which had washed away the lower part of the hill must have carried off many of the dead.