The mangonel was the most common used during the Medieval Period.
The mangonel was developed by the Romans. It was powered by tension
created by twisted ropes like the ballista, but had only one arm instead
of two. The advantage of this catapult was that it was very light
and its ability to throw rock and fire. The major disadvantage was
that it was not that accurate. The range was determined by the weight
of the projectile and the strength of the mangonel. In order to get
the catapult into effective range of a castle, it would have to come into
range of the castle's defenders.
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