Diary for Thursday, September 12, 1940:
Air War
RAF Bomber Command attacks Hamm marshalling yards for sixtieth time (night September 12-13).
Occupied countries
Poland: 500,000 Warsaw Jews to be confined in walled ghetto.
Neutrals
Vichy France: Five French schoolboys discover 10,000-year-old wall paintings of animals and hunters in Lascaux Cave (Dordogne).