Battle of Britain Day,15th of September 1940 🇬🇧🇬🇧🇬🇧 Battle of Britain Day is the name given to the large-scale aerial battle that took place on 15 September 1940, during the Battle of Britain. In June 1940, the Wehrmacht had conquered most of Western Europe and Scandinavia. At that time, the only major power standing in the way of a German-dominated Europe was the British Empire and the Commonwealth. After having several peace offers rejected by the British, Adolf Hitler ordered the Luftwa