The Roman History · Amm. 16.12.5

For he had defeated the Cæsar Decentius in a pitched battle, and he had plundered and destroyed many wealthy cities, and he had long ravaged all Gaul at his own pleasure without meeting with any resistance. And his confidence was now increased by the recent retreat of a general superior to him in the number and strength of his forces.

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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