The Luftwaffe's Black Thursday

15th August 1940: The weather finally clears for the planned German mass attack - but RAF resistance is much stronger than expected

Heinkel He 111 bombers crossed the North Sea from Norway to attack RAF airfields in the north of England.

The 15th August saw some of the fiercest fighting of the Battle of Britain as the Luftwaffe launched a series of raids aimed mainly at RAF bases. This was intended as the knockout blow that had been envisaged on 'Eagle Day', although the results were…