The Roman History · Amm. 23.2.7

Having collected all his troops from thence, he marched with such speed towards Mesopotamia, that before any intelligence of his march could arrive (an object about which he was especially solicitous) he came upon the Assyrians quite unexpectedly. Then having led his whole army and the Scythian auxiliaries across the Euphrates by a bridge of boats, he arrived at Batnæ, a town of Osdroene, and there again a sad omen met 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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