The Roman History · Amm. 21.1.1

While Constantius was detained by this perplexing war beyond the Euphrates, Julian at Vienne devoted his days and nights to forming plans for the future, as far as his limited resources would allow; being in great suspense, and continually doubting whether to try every expedient to win Constantius over to friendship, or to anticipate his attack, with the view of alarming him.

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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