The Roman History · Amm. 20.11.15

And on the other hand, when the enormous ram was brought against the tower to which it was applied, as if it could at once throw it down, the garrison, by a clever contrivance, entangled its projecting iron head, which in shape was like that of a ram, with long cords on both sides, to prevent its being drawn back and then driven forward with great force, and to hinder it from making any serious impression on the walls by repeated blows; and meanwhile they poured on it burning pitch, and for a long time these engines were fixed at the point to which they had been advanced, and exposed to all the stones and javelins which were hurled from the walls.

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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