- 1916 15 Sep The British Army makes the first use of tanks in warfare, at Flers Courcelett during the Battle of the Somme.
- 1935 15 Sep Nazi Germany passes the 'Nuremberg Laws' - a raft of legislation dramatically curtailing Jewish rights.
- 1940 15 Sep The Royal Air Force claims victory over the Luftwaffe, commemorated as Battle of Britain Day.

