of many bombing raids in what became known as the battle of britain. but the raf‘s pilots managed to fight off the luftwaffe and defend these shores in their spitfires and hurricanes. it is the most famous plane from world war ii. it played a crucial role in the battle of britain. but what we didn't know until now was the role that a 13—year—old girl played in its design. this new generation of fighter plane had originally been designed with just four machine—guns. but this man, captain fred hill, a scientific officer in the air ministry, became convinced that four guns would not be enough. each plane needed eight. he faced stiff opposition. most thought eight guns would be too many, impossible to fit on the planes, but captain hill was convinced he was right, so he turned to an unlikely person for help — his 13—year—old