The Magnificent Seven, in chainmail. Jonathan English's action movie takes history as its base metal – the siege of Rochester Castle by King John in 1215 – and forges it into the cold steel of Medieval derring-do. Once you get past sniggering at Paul Giamatti as John, it's a pretty enjoyable face-off between the king's mercenary army and a rag-tag band of patriots led by James Purefoy's self-denying Templar knight and Brian Cox's lusty Baron. The trimmings are standard-issue: full-throated Middle Ages cackling, gnarled peasant faces straight out of Brueghel and lots of ferocious hand-to-hand combat with pluming fountains of blood. But it's a persuasive portrayal of a violent era and its harsh privations.