The Roman History · Amm. 27.5.6

With similar perseverance he again invaded the land of the barbarians a third year, having crossed the river by a bridge of boats at Nivors; and by a rapid march he attacked the Gruthungi, a warlike and very remote tribe, and after some trivial skirmishes, he defeated Athanaric, at that time the most powerful man of the tribe, who dared to resist him with what he fancied an adequate force, but was compelled to flee for his life. And then he returned himself with his army to Marcianopolis to spend the winter there, as the cold was but slight in that district.

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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