The Roman History · Amm. 31.7.2

When they arrived at the place where it seemed most expedient to combat this hostile multitude in detail and by ambuscades and surprises, they very injudiciously adopted the ill-considered plan of opposing the legions which had arrived from Armenia to barbarians who were still raging like madmen. Though the legions had repeatedly proved equal to the dangers of a pitched battle and regular warfare, they were not suited to encounter an innumerable host which occupied all the chains of the lofty hills, and also all the plains.

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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