In the summer of 1940 a desperate battle raged in the skies of England. If Britain lost, Hitler would invade. At the heart of the fight was one remarkable squadron. Brave, rebellious, unconventional. 303 squadron shot down twice as many Germans and boasted one of the Battle of Britain's greatest aces. This dramatised documentary recounts how, during the most decisive phase of The Battle of the Britain, a single squadron of 34 Polish fighter pilots wreaked havoc on the Luftwaffe, in the process helping to change the course of history and overturning RAF prejudices.