The Roman History · Amm. 28.2.8

But since it was to no purpose that they used these and similar arguments, as they were not listened to, and finding that they had no chance of a conciliatory answer, they reluctantly returned, bewailing the loss of their sons; and when they were gone, from a secret hiding-place in a neighbouring hill a troop of barbarians sprang forth, waiting, as far as was understood, for the answer which was to be given to the nobles; and attacking our half-naked soldiers, who were carrying loads of earth, drew their swords and quickly slew them, and with them the two generals.

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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