The Roman History · Amm. 21.13.8

And as that plan was universally approved, the troops went as they were commanded, in the lightest marching order. But the next day, while he was finally arranging these matters, he received intelligence that Sapor, with his whole army, had returned to his own country, because the auspices were unfavourable. So, his fears being removed, he called in all the troops except those who as usual were assigned for the protection of Mesopotamia, and returned to Hierapolis.

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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