Anabasis

BOOK IV

 (In the preceding portion of the narrative a full account is
given of the incidents of the march up to the battle, and of
the occurrences after the battle during the truce which was
established between the king and the Hellenes, who marched up
with Cyrus, and thirdly, of the fighting to which the Hellenes
were exposed, after the king and Tissaphernes had broken the
treaty, while a Persian army hung on their rear. Having
finally reached a point at which the Tigris was absolutely
impassable owing to its depth and breadth, while there was no
passage along the bank itself, and the Carduchian hills hung
sheer over the river, the generals took the resolution above
mentioned of forcing a passage through the mountains. The
information derived from the prisoners taken along the way led
them to believe that once across the Carduchian mountains they
would have the choice either of crossing the Tigris—if they
liked to do so—at its sources in Armenia, or of going round
them, if so they preferred. Report further said that the
sources of the Euphrates also were not far from those of the
Tigris, and this is actually the case. The advance into the
country of the Carduchians was conducted with a view partly to
secrecy, and partly to speed, so as to effect their entry
before the enemy could occupy the passes.)