Samippus We have now crossed Mesopotamia, and no enemy has yet shown himself; town after town has voluntarily given itself up; we reach Babylon; we enter its gates without warning, and the city is ours. The Persian king meanwhile is at Ctesiphon. He hears of our approach and withdraws to Seleucia, where he proceeds to muster his full strength of cavalry, bowmen, and slingers. Our scouts report that the force already collected numbers something like a million, including two hundred thousand mounted bowmen; and the Armenian, Caspian, and Bactrian contingents are still to come; only the neighbouring districts, the suburbs, as it were, of the empire, have contributed as yet. With such ease does the Persian monarch raise a million of men! It is now time for us to think what we are to do next.