The Roman History · Amm. 26.9.7

Encouraged by this, Valens quickly moved his camp to Phrygia, and engaged the enemy near Nacolia, and the battle was doubtful till Agilo, the leader of Procopius's forces, betrayed his side by a sudden desertion of his ranks; and he was followed by many who, brandishing their javelins and their swords, crossed over to the emperor, bearing their standards and their shields reversed, which is the most manifest sign of defection.

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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