The Roman History · Amm. 26.9.8

When this unexpected event took place, Procopius abandoning all hope of safety, dismounted, and sought a hiding-place on foot in the groves and hills. He was followed by Florentius and the tribune Barchalbas, who having been known ever since the time of Constantine in all the terrible wars which had taken place, was now driven into treason by necessity not by inclination.

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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