Dan Snow takes a look at the counter balance trebuchet, a medieval siege weapon capable of firing a projectile that weighs 2 - 300 kilograms, heavy enough to threaten even the sturdiest battle castles! Subscribe to Discovery TV for more clips from Battle Castle and other great shows: http://www.youtube.com/subscription_center?add_user=DiscoveryTV Follow Discovery on Twitter: http://www.twitter.com/DiscoveryUK

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