Battle of Britain is a 1969 British Second World War film directed by Guy Hamilton, and produced by Harry Saltzman and S. Benjamin Fisz. The film broadly relates the events of the Battle of Britain. The script by James Kennaway and Wilfred Greatorex was based on the book The Narrow Margin by Derek Wood and Derek Dempster. The film endeavoured to be an accurate account of the Battle of Britain, when in the summer and autumn of 1940 the British RAF inflicted a strategic defeat on the Luftwaffe and so ensured the cancellation of Operation Sea Lion – Adolf Hitler's plan to invade Britain. The film is notable for its spectacular flying sequences, in contrast with the unsatisfactory model work seen in Angels One Five (1952) and on a far grander scale than had been seen on film before; these made the film's production very expensive.