18. The Poland Invasion
Even though Poland received reassurance that England and France would protect them if Germany invaded, on 1 September 1939, the German military invaded Poland with 2,000 tanks and 1,000 planes. After 27 days, Warsaw had to surrender. As a response, England and France declared war on Germany but did nothing more after the Poland invasion. The country remained occupied by the Nazis until 1945.
Then Greece almost came next…