00:00Roman legionaries brace behind heavy wooden shields as crushing stone projectiles shatter castle walls.
00:07How did a single wooden arm hurl massive boulders hundreds of yards without any gunpowder whatsoever?
00:14Common sense says a giant metal spring powers the launch, but the real secret uses twisted animal tendons.
00:22Twisted sinew stores massive kinetic energy, creating a violent recoil that earned the machine its animal name.
00:30This brutal recoil mimics the wild beast, proving Roman legionaries brace behind heavy wooden shields.
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