The Roman History · Amm. 19.7.8

For the king of the Persians himself, who is never expected to mingle in the fight, being indignant at these disasters, adopting a new and unprecedented mode of action, sprang forth like a common soldier among his own dense columns; and as the very number of his guards made him the more conspicuous to us who looked from afar on the scene, he was assailed by numerous missiles, and was forced to retire after he had lost many of his escort, while his troops fell back by echellons; and at the end of the day, though frightened neither by the sad sight of the slaughter nor of the wounds, he at length allowed a short period to be given to rest.

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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