Theres a really interesting show on the history channel about Alexander the Great and his invention of the Tosion Catapult and how he used it to assault the island city off Tyre of the coast of what is now Lebanon.

This catapult could launch a 30 pond rock 300 yards and a 20 pound iron arrow with great accuarcy at advancing troops impailing 4 and 5 at a time.

Really interesting show if you like old traditional weaponry