The Roman History · Amm. 31.7.3

Our men had never yet experienced what can be effected by indomitable rage united with despair, and so having driven back the enemy beyond the abrupt precipices of the Balkan, they seized upon the rugged defiles in order to hem in the barbarians on ground from which they would be unable to find any exit, and where it seemed they might be overcome by famine. They themselves intended to await the arrival of Frigeridus, the duke, who was hastening towards them with the auxiliaries from Pannonia and other countries, and whom, at the request of Valens, Gratian had commanded to march to the camp to aid those who were menaced with total destruction.

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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