Definition: In this task, five ordered key facts are given. All the given facts are expressed in natural language. Your job is to generate a story 100 to 1000 words long, that includes all the facts given as input in their order of appearance while expanding upon them to produce a broader, yet coherent, narrative.
Input: Fact1: Britain facing invasion and aerial attacks on island increasing, Fact2: RAF Squadron Leader Geoffrey Crisp during Battle of recounts story of how friend designed Spitfire fighter Britain, Fact3: designer promises to hire him as test pilot, Fact4: Mitchell After visit to resolves to build fastest and deadliest fighter aircraft Germany in 1930s and chance meeting with leading German aircraft designer Willy Messerschmitt, Fact5: squadron is scrambled to counter German attack

A newsreel sets the scene for summer 1940, showing Nazi advances in Europe with Britain facing invasion and aerial attacks on the island increasing. On 15 September 1940, during the Battle of Britain, RAF Squadron Leader Geoffrey Crisp David Niven, the station commander of a Spitfire squadron, recounts the story of how his friend, R. J. Mitchell Leslie Howard designed the Spitfire fighter. His pilots listen as Crisp begins with the 1922 Schneider Trophy competition, where Mitchell began his most important work, designing high speed aircraft. While watching seagulls with his binoculars, he envisages a new shape for aircraft in the future. Crisp, an exFirst World War pilot seeking work, captivates Mitchell with his enthusiasm and the designer promises to hire him as test pilot should his design ever go into production. Facing opposition from official sources, Mitchell succeeds in creating a series of highly successful seaplane racers, eventually winning the Schneider Trophy outright for Great Britain. After a visit to Germany in the 1930s and a chance meeting with leading German aircraft designer Willy Messerschmitt, Mitchell resolves to build the fastest and deadliest fighter aircraft. Convincing Henry Royce of RollsRoyce that a new engine, eventually to become the famous RollsRoyce Merlin, is needed, Mitchell gets the powerplant he requires. Faced by the devastating news that he has only one year to live and battling against failing health, Mitchell dies as the first prototype Supermarine Spitfire takes to the skies. Crisp ends his account when the squadron is scrambled to counter a German attack: the fight sees the Germans beaten, with the Luftwaffe losing more planes than the British. In the end, Crisp is happy over the victory and looks to the heavens to Mitchell, voicing a thanks to Mitchell for creating the Spitfire.