The Roman History · Amm. 25.6.15

And when the signal was seen, the soldiers became eager to cross, and could only be restrained by the promise of the engineers to make them bridges by means of bladders and the hides of slaughtered animals.

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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