RAF
Biggin Hill: Where The Battle of Britain Was Fought
They came in their thousands to remember the day 75 years ago that the German Luftwaffe launched an all out air offensive against Britain.
The 'Hardest Day' was the single most destructive day of aerial combat during the Battle of Britain.
Forces News' Carla Prater spoke to some of the veterans of those air battles, who were at Biggin Hill once again as the Spitfires and Hurricanes took to the skies.