From the Tigris they marched four stages, twenty parasangs, to the Physcus river, which was a plethrum in width and had a bridge over it. There was situated a large city named Opis, near which the Greeks met the bastard brother of Cyrus and Artaxerxes, who was leading a large army from Susa and Ecbatana to the support, as he said, of the King; and he halted his own army and watched the Greeks as they passed by.
Anabasis. Xenophon. Carleton L. Brownson (Translator). Cambridge, MA. 1921-1922.
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