The Further Adventures of Robinson Crusoe by Daniel Defoe Chapter 15 Page 31

We may well be supposed to have wanted rest again after this long journey; for in this desert we neither saw house nor tree, and scarce a bush; though we saw abundance of the sable-hunters, who are all Tartars of Mogul Tartary; of which this country is a part; and they frequently attack small caravans, but we saw no numbers of them together.

After we had passed this desert we came into a country pretty well inhabited — that is to say, we found towns and castles, settled by the Czar with garrisons of stationary soldiers, to protect the caravans and defend the country against the Tartars, who would otherwise make it very dangerous travelling; and his czarish majesty has given such strict orders for the well guarding the caravans, that, if there are any Tartars heard of in the country, detachments of the garrison are