http://www.onwar.com/chrono/1940/sep40/f20sep40.htm
Convoy attackers go undetected
Friday, September 20, 1940 www.onwar.com
In the North Atlantic... The convoy HX-72 is successfully attacked by a U-boat group over the course of a three day period. Altogether 12 ships of 78,000 tons are sunk, seven of them during the night of September 21-22 by Schepke’s U-100 without him even being detected by the convoy escorts.
http://homepage.ntlworld.com/andrew.etherington/month/thismonth/20.htm
September 20th, 1940
UNITED KINGDOM:
RAF Bomber Command: 4 Group (Whitley). Bombing - marshalling yards at Hamm - Flushing Docks- industrial targets at Brussels, Krefeld, Mannheim and Osnabruck.
10 Sqn. Ten aircraft to Hamm. All bombed, four damaged by Flak.
58 Sqn. Three aircraft to Osnabruck. All bombed. Two aircraft to Mannheim, both bombed. One aircraft to Flushing. Bombed.
77 Sqn. Seven aircraft to Krefeld, Brussels and Flushing. All bombed.
Battle of Britain:
Heavy fighter sweeps towards London lead to dogfights, the outcome favouring the Luftwaffe more than usual. At night London is bombed, along with Bath and targets in the Gloucester and Bristol areas.
Losses: Luftwaffe, 7; RAF, 7.
ATLANTIC: The Australian cruiser HMAS Australia intercepts the French cruiser Gloire, which is sailing from Casablanca to Dakar, French West Africa. The French ship is forced to return to Casablanca. (Jack McKillop)
CANADA: The third group of 6 “overage” destroyers being transferred to the RN in the destroyers-for-bases agreement arrive at Halifax, Nova Scotia. (Jack McKillop)
CHINA: The Chinese Eighth Route Army attacks Japanese lines, launching the second phase of a Communist “Hundred Regiments Offensive.”