Britain's Prince William, Duke of Cambridge, and Catherine, Duchess of Cambridge, walk down the red carpet with an umbrella as they attend the UK premiere of Steven Spielberg's "War Horse" in Leicester Square in London, England, on Jan. 8. Michael Morpurgo's book was turned into a hugely successful international theatrical hit before being made into a film. Starring British actor Jeremy Irvine, the film tells the story of the First World War through the journey of a horse and it's owner.