The Roman History · Amm. 17.13.18

But when the weapons glittered in the distance, and they perceived that what they feared was upon them, they sought refuge in their accustomed marshes. And our soldiers pursuing them with great animosity, slew numbers of them, and gained a victory in a place where it had not been supposed that any soldier could find a footing, much less do any bold action.

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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