The Roman History · Amm. 23.4.5

From these ropes thus placed a wooden pin rises in an oblique direction, like the pole of a chariot, and it is so fastened by knotted cords as to be raised or depressed at pleasure. To its top, iron hooks are fastened, from which a sling hangs, made of either cord or iron. Below the pin is a large sack filled with shreds of cloth, fastened by strong ties, and resting on heaped-up turves or mounds of brick. For an engine of this kind, if placed on a stone wall would destroy whatever was beneath it, not by its weight, but by the violence of its concussion.

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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