On this day in 1939, German forces bombard Poland on land and from the air, as Adolf Hitler seeks to regain lost territory and ultimately rule Poland. World War II had begun. The German invasion of Poland was a primer on how Hitler intended to wage war--what would become the "blitzkrieg" strategy. Klara was 15 years old when the Germans invaded Poland, and bombed the city of Wieluń, killing her brother, father and sister. Now Klara and her mother have to survive the horrors of the Nazi regime in a living hell.