Question: what are the key events of ww2?
Answer: 7 July 1937: Clash near the Marco Polo Bridge, close to Beijing. ...  10 May 1940: Germans launch offensive in the West. ...  12 August 1940: Battle of Britain begins. ...  22 June 1941: Launching of Operation Barbarossa. ...  7 December 1941: Attack on Pearl Harbor. ...  4 June 1942: Battle of Midway.