The Roman History · Amm. 20.9.3

But in spite of his anger he was greatly perplexed to decide whether to move those troops whom he could trust against the Persians, or against Julian; and while he was hesitating, and long balancing between the two plans, he yielded to the useful advice of some of his counsellors, and ordered the army to march to the East.

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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