http://www.onwar.com/chrono/1940/oct40/f15oct40.htm
Luftwaffe targets London
Tuesday, October 15, 1940 www.onwar.com
From Berlin... Goring issues orders to give priorities for the German night offensive against Britain. The priorities are firstly London, secondly aircraft factories and third industry in the Midlands and all air bases.
Over Britain... About 400 Luftwaffe bombers attack London by moonlight, dropping 530 tons of high explosive bombs, starting 900 major fires and seriously disrupting road and rail communications. Oxford Street is blocked by rubble; the BBC Broadcasting House is hit. About 400 are killed, 900 are injured and some 600 people are trapped in Balham Underground Station.
From Rome... The Italian War Council makes the final decision for an attack on Greece. Hitler is not to be told beforehand and instead is to be presented with a fait accompli. The Italians hope for the campaign to be over within two weeks. Operations will start at the end of the month.
Over Germany... The RAF conducts a nighttime raid on Kiel.
In the Mediterranean... The British submarine Rainbow engages the Italian submarine Enrico Toti (which was previously damaged and is unable to submerge) in a gun battle off the coast of Calabria. The Rainbow is sunk.