The Roman History · Amm. 16.11.6

Nor was he mistaken; for all who came by these roads were slaughtered by our men, and the whole of the booty which they were carrying off was recovered unhurt. Those alone escaped in safety who passed by the camp of Barbatio, who were suffered to escape in that direction because Bainobaudes the tribune, and Valentinian (afterwards emperor), who had been appointed to watch that pass with the squadrons of cavalry under their orders, were forbidden by Cella (the tribune of the Scutarii, who had been sent as colleague to Barbatio) to occupy that road, though they were sure that by that the Germans would return to their own country.

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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