| On September 1, 1939, Germany invaded Poland. The Polish army expected the attack to come along the Polish frontiers. But Hitler introduced a new kind of war called a blitzkrieg, which means “lightning war.” Waves of German bombers targeted railroads in Tczew, shown here, which crippled Polish military mobilization. Hundreds of tanks smashed through Polish defenses and rolled deep into the country. The Poles fought hard, but on September 17, the Soviet Union invaded their country from the east. By the end of the month, Poland had fallen. |