The Greeks are visited by Mithridates as a friend, but he soon shows that he is an enemy, and they resolve to enter into no further negotiations with the Persian king. They pass the Zabatus, are harassed by Mithridates, and suffer from the want of slingers and cavalry. Volunteers are enrolled for these services.Mithridates again pursues the Greeks, but is repulsed. They reach the Tigris, encamp at Mespila, and are attacked by Tissaphernes with a numerous force. They repel him, and alter their order of march. Traversing a mountainous part of the country, they are harassed by the enemy, till, on getting possession of a height, they are enabled to reach the plain beyond it in safety.CHAPTER IV