The Roman History · Amm. 29.5.3

But when Firmus perceived that these intrigues were going on to keep his defence out of sight, trembling for fear of the worst if all his excuses should be passed over, and he himself be condemned as disaffected and mischievous, and so be put to death, he revolted from the emperor's authority, and aided ... in devastation.

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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