Roman soldiers using two forms of battering ram against the walls of a fortress.  A, in the foreground, is the simple form resting on the men's shoulders, while the one at B is hung on a chain hanging from a frame, so enabling the men to concentrate their strength on thrusting the battering ram forward.  From 'Poliorceticon sive de machinis tormentis telis' by Justus Lipsius (Joost Lips) (Antwerp, 1605). Engraving.
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