Germany invades Belgium, the Netherlands, Luxembourg, and France
The Battle of Britain begins
Hide! The planes are coming!
Despite promising not to, Nazi Germany invades Poland’s capital in a huge, well-planned attack. German forces easily defeat the Polish army and receive Warsaw’s official surrender within mere weeks of the attack.
Axis Powers sign the Tripartite Pact
Germany launches a blitzkrieg attack and invasion of Belgium, the Netherlands, Luxembourg, and France. All of the countries except France have surrendered within a few weeks.
Germany invades the Soviet Union
It's so cold...
Nazi Germany begins its bombing raid against Great Britain in the Battle of Britain in an attempt to gain control of British airspace.
Japan bombs Pearl Harbor
Germany, Italy, and Japan sign the Tripartite Pact in Berlin to formalize the alliance of the Axis Powers. The Tripartite Pact promises mutual assistance if any of its members are attacked by any nation that is not already involved in the war.
Germany launches Operation Barbarossa, the largest German military effort of World War II, which is the invasion of the Soviet Union. Within a few weeks of being attacked, the Soviet Union has formally joined the Allied nations.
Japan launches a surprise attack on American soil and bombs Hawaii’s naval base at Pearl Harbor on the island of Oahu. More than 2,300 American soldiers and sailors die in the attack, and another 1,100 are wounded. Americans will remember this attack for decades to come.