The Nazis walled off the ghetto in November 1940, cramming 400,000 Jews from across Poland into a 760-acre section of the capital in inhuman conditions. On April 19, 1943, German troops started to liquidate the ghetto by sending tens of thousands of its residents to death camps.....Then 24 years old, Edelman took command of one of the revolt's three groups. His fighters, between the ages of 13 and 22, scraped together guns and ammunition that they and the Polish resistance managed to smuggle in from the outside.