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With the invasion of Poland in 1939.
World War 2, with his invasion of Poland on September 1, 1939.
It marked the start of the overthrow of Third Reich.
The largest invasion of WWII (and in fact the largest invasion in world history) was Operation Barbarossa - the Axis invasion of the Soviet Union. The invasion force consisted of nearly four million troops (approximately three million Germans plus one million from Romania, Hungary, Italy, Finland, Slovakia and Croatia).
No. WWI was started by politics so WWI was more politically complex.