The Roman History · Amm. 15.4.8

In the mean time the enemy, showing themselves, sprang forth from their hiding-places and spared not one who came in their way, but overwhelmed them with every kind of weapon. For none of our men could offer the smallest resistance, nor was there any hope of any of them being able to save their lives except by a speedy flight. Therefore, being intent only on avoiding wounds, our soldiers, losing all order, ran almost at random in every direction, exposing their backs to the blows of the enemy. Nevertheless the greater part of them, scattering themselves among narrow paths, were saved from danger by the protecting darkness of the night, and at the return of day recovered their courage and rejoined their different legions. But still by this sad and unexpected disaster a vast number of common soldiers and ten tribunes were slain.

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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