The Roman History · Amm. 29.5.48

On the other side, the Roman army, though scanty in numbers, nevertheless being full of natural courage, and elated by their past victories, formed into dense columns, and joining their shields firmly together, in the fashion of a testudo, planted their feet firmly in steady resistance; and from sunrise to the close of day the battle was protracted. A little before evening Firmus was seen mounted on a tall horse, expanding his scarlet cloak in order to attract the notice of his soldiers, whom he was exciting with a loud voice at once to deliver up Theodosius, calling him a ferocious and cruel man—an inventor of merciless punishments—as the only means of delivering themselves from the miseries which he was causing them.

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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