The Roman History · Amm. 27.5.3

And being now full of elation and confidence, as while traversing the country in every direction he met with no enemy to be either defeated or even alarmed by his advance; they having all been so terrified at the approach of so formidable a host, that they had fled to the high mountains of the Serri, which were inaccessible to all except those who knew the 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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