Germany's WWII Invasion Timeline: 1939–1941

Key German invasions during WWII:

• Sep 1, 1939: Poland (WWII begins)
• Apr 9, 1940: Denmark & Norway (Weserübung)
• May 10, 1940: Luxembourg, Belgium, Netherlands (Fall Gelb)
• Jun 5, 1940: France (Fall Rot; main offensive)
• Jun 10, 1940: Monaco (occupied with France)
• Apr 6, 1941: Yugoslavia & Greece (Operation Marita)
• Jun 22, 1941: Soviet Union (Operation Barbarossa)
• Jun 25, 1941: Lithuania, Latvia, Estonia (Baltic states, part of Barbarossa)

Monaco was occupied simultaneously with southern France. The Baltic states were incorporated into the USSR in 1940; Germany invaded them in 1941.