World War II - Declarations of War, Invasions and Surrenders 1939 - Sept. 1 - Germany invades Poland. - Sept. 3 - Great Britain and France declare war on Germany. - Nov. 30 - Russia invades Finland. 1940 - Apr. 9 - Germany invades Denmark and Norway. - May 10 - Germany invades Holland, Belgium and Luxembourg. - May 16 - Germany invades France. - June 10 - Italy declares war on France and Great Britain. - Oct. 7 - Germany invades Rumania - Oct. 28 - Italy invades Greece. 1941 - Apr. 6 - Germany invades Yugoslavia and Greece. - June 22 - Germany declares war on Russia. - Dec. 7 - Japan bombs Pearl Harbor, declares war on the United States and Great Britain. - Dec. 8 - United States and Great Britain declare war on Japan. - Dec. 8 - China declares war on Japan, Germany, and Italy. - Dec. 11 - Germany and Italy declare war on the United States. - Dec. 11 - United States declares war against Germany and Italy. 1942 - May 22 - Mexico declares war on Germany and Italy. - Aug. 22 - Brazil declares war on Germany and Italy. 1943 - Apr. 7 - Bolivia declares war against the Axis Powers. - Sept. 3 - Allies invade Italy. - Sept. 8 - Italy surrenders to the Allies. - Oct. 13 - Italy (Badoglio government) declares war on Germany. 1944 - June 6 - D-Day - Allies invade the Channel Coast. - Sept.13 - Rumania signs armistice. 1945 - Feb. 23 - Turkey and Egypt declare war against Axis. - Mar. 27 - Argentina declares war on Germany. - May 2 - German army in Italy surrenders to Allies. - May 8 - Germany surrenders unconditionally to the Allies. - Aug. 8 - Russia declares war on Japan. - Sept. 2 - Japan surrenders.