The Roman History · Amm. 18.7.9

When they had arrived at a small place called Bebase (from which place to the town of Constantina, which is one hundred miles distant, the whole country is an arid desert, except where a little water is found in some wells), they hesitated for some time, doubting what to do; and at last resolving to proceed in reliance on the endurance of their men, they learnt from a trusty spy that the Euphrates was swollen by the melting of the snow, and was now extensively inundating the adjacent lands, and so could not possibly be forded.

Ammianus Marcellinus · translated by C. D. Yonge · 1911 reprint
C. D. Yonge translation (preface dated February 1862); G. Bell and Sons, 1911; Project Gutenberg #28587
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