On April 19, 1943, thousands of Nazi troops were given the order to remove all Jews in the Warsaw ghetto, a few square blocks sheltering the remnants of the half million or more Jewish citizens of Poland's capital, to the death camps of Treblinka and Auschwitz. They were to kill those who resisted. A few hundred of the trapped Jews, mostly teenagers, armed only with pistols, Molotov cocktails, and a few light machine guns, vowed to fight back. Resistance...