The Warsaw Ghetto Uprising began in January 1943 as the Nazis started the second round of deportations of Jews from the Warsaw Ghetto to concentration camps. Members of the Jewish resistance groups engaged the Nazis in combat and their numbers grew to over 1,000 fighters by April 1943, though they were poorly armed with only pistols, revolvers, and small quantities of rifles. On April 19, 1943 the Nazis entered the ghetto intending to crush the uprising in three days, but were ambushed by Jewish fighters using Molotov cocktails and other improvised weapons, though the ghetto was ultimately burned to the ground by the Nazis over the following weeks. Approximately 13,000 Jews were killed during