World II By Basharhalif Sep 1, 1939 Nazi Attack Poland. WWII began Without declaring war, Germany invades Poland. The coordinated air-and-land attack is conducted with such brutal efficiency that "blitzkrieg" becomes a feared offensive tactic. Jun 9, 1940 Germany invades and takes control of Denmark and Norway. Jul 10, 1940 Battle of Britain Dec 7, 1941 Japanese Attack US in pearl harbor
