Irena Sendler smuggled children in boxes, suitcases and caskets, saving the lives of more than 2,500 Jewish children. During World War II, she watched in horror as the Nazis forced Jewish people to live in a ghetto in Warsaw, Poland where disease ran rampant. Soon, it became clear that the Nazis intended to exterminate the Jews. That’s when Sendler took courageous action. To gain access to the ghetto, she pretended to be a nurse. She used a fake I.D. and told German soldiers she was there to deliver supplies and care for the sick.