The Roman History · Amm. 23.3.9

And while addressing them a fleet arrived equal to that of the mighty sovereign Xerxes, under the command of the tribune Constantianus, and Count Lucillianus; they threw a bridge over the broadest part of the Euphrates: the fleet consisted of one thousand transports, of various sorts and sizes, bringing large supplies of provisions, and arms, and engines for sieges, and fifty ships of war, and as many more suitable for the construction of bridges.

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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