invasion+of+Poland+By+Nazi+Germany

Hitler began driving a new German war machine across Europe in 1939. His invasion of Poland in September 1939 was that set off World War II, the most devastating period in the history of the Polish state. Between 1939 and 1945, 6 million people, over 15 percent of Poland's population, Died, with the mass extermination of Jews in concentration camps in Poland. The war left much of the country in ruins.