Timeline of the Eastern Front of World War II

The Eastern Front was a theatre of World War II which primarily involved combat between the nations and allies of Nazi Germany and the Soviet Union. Combat in the Eastern Front began with the two powers remaining peaceful towards each other, with the annexation of countries such as Albania and portions of Poland by Germany and its allies, and the annexation of Finland and the rest of Poland by the Soviet Union.

Source: Wikipedia — Timeline of the Eastern Front of World War II (CC BY-SA 4.0)