The Greeks arrive at the river Centrites, which divides the Carduchi from Armenia. They see the Persians drawn up on the opposite bank, while the Carduchi threaten their rear. They are encouraged by a dream of Xenophon's to try a ford, and effect a safe passage across the stream.The Greeks enter Armenia, pass the sources of the Tigris, and arrive at the Teleboas. They make a treaty with Tiribazus, the governor of the province, and discover his insincerity.CHAPTER IV.