The movie Ironclad, just released, about the English King who signed the Magna Carta, takes us on a bloody journey that involves the meglomaniacal King John on his quest for revenge for being forced to sign away his kingly rights to the common folk. Rochester Castle is occupied by rebels to the Crown, and a seige ensues. Castles at this point are pretty tough to knock down or blow up, which is why gunpowder came in so handy when it was finally invented. A few big seige guns would have been nice too, but these guys have to get up close and personal.