How did drawbridges work?

Classical drawbridges worked via the principle of counterweight,
with large wood and metal bridges pivoted via a series of
balancing weights in a castle’s gatehouse. The weights, which
were attached to the bridge’s lifting chains, enabled the platform to be
raised via a windlass, which in turn rotated a pair of lifting drums that
gathered in the chains. By employing counterweights, heavy bridges
could be operated by just a few people. Along with a moat, a reinforced
drawbridge served as a two-fold barrier, making it much more diffi cult
for any enemies to invade a fortifi cation or city.

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