Policies of oppression and genocide fueled resistance to the Nazis in the Third Reich and occupied Europe. Both Jews and non-Jews responded to Nazi oppression in various ways. Organized armed resistance was the most forceful form of Jewish opposition to the Nazis. The largest armed uprising was the Warsaw ghetto uprising (April-May 1943), sparked by rumors that the Nazis would deport the remaining ghetto inhabitants to the Treblinka extermination camp in Poland. As German forces entered the ghetto, members of the Jewish Fighting Organization (Zydowska Organizacja Bojowa; ZOB) pelted German tanks with hand grenades. It took the Nazis 27 days to destroy the ghetto and snuff out the last resistance.