The Roman History · Amm. 31.13.8

While they were all flying and scattering themselves over roads with which they were unacquainted, the emperor, bewildered with terrible fear, made his way over heaps of dead, and fled to the battalions of the Lancearii and the Mattiarii, who, till the superior numbers of the enemy became wholly irresistible, stood firm and immovable. As soon as he saw him. Trajan exclaimed that all hope was lost, unless the emperor, thus deserted by his guards, could be protected by the aid of his foreign allies.

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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