The Roman History · Amm. 23.4.15

Then if it be shot slowly from a slack bow (for if it be shot with too much speed the fire is extinguished), so as to stick anywhere, it burns obstinately, and if sprinkled with water it creates a still fiercer fire, nor will anything but throwing dust upon it quench it. This is enough to say of mural engines; let us now return to our original subject.

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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