What was the German aggression in World War 2?

The start of World War II was signaled by the German invasion of Poland on September 1st, 1939. Following this action, Britain and France declared war on Germany.

Following this, German invaded Norway, Denmark, Belgium, Luxembourg, Netherlands (Holland), and France. France capitulated, and Southern France was allowed to govern itself until the American invasion of North Africa during Operation Torch.

German invaded Yugoslavia, and was forced to help its Italian ally when Italy invaded Greece (Italy failed to take Greece alone). The British Channel Islands were also taken.

Germany's last act of invasion was the Invasion of Russia (then the Soviet Union) in 1941.