Ironclad is a 2011 British action adventure war film directed by Jonathan English. Written by English and Erick Kastel, based on a screenplay by Stephen McDool, the cast includes James Purefoy, Brian Cox, Kate Mara, Paul Giamatti, Vladimir Kulich, Mackenzie Crook, Jason Flemyng, Derek Jacobi, and Charles Dance. The film chronicles the siege of Rochester Castle by King John in 1215. The film was shot entirely in Wales in 2009 and produced on a budget of $25 million.