Poland's involvement in World War II began on September 1, 1939

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Poland's involvement in World War II began on September 1, 1939, when Nazi Germany invaded, marking the start of the war. Just 16 days later, the Soviet Union invaded from the east, dividing the country between the two occupying forces. Poland endured a brutal occupation marked by widespread atrocities, including the extermination of millions of Polish Jews in concentration camps like Auschwitz. The Warsaw Ghetto Uprising in 1943 saw Jewish residents attempt to resist the Nazis, though it was ultimately crushed. In 1944, the Warsaw Uprising saw further Polish resistance, but the city was devastated, leaving Poland scarred by the war's end.