The Warsaw Ghetto Uprising (Yiddish: אױפֿשטאַנד אין װאַרשעװער געטאָ, romanized: Ufshtand in Varshever Geto; Polish: powstanie w getcie warszawskim; German: Aufstand im Warschauer Ghetto) was the 1943 act of Jewish resistance in the Warsaw Ghetto in German-occupied Poland during World War II to oppose Nazi Germany's final effort to transport the remaining ghetto population to Majdanek and Treblinka concentration camps. After the Grossaktion Warsaw of summer 1942, in which more than a quarter of a million Jews were deported from the ghetto to Treblinka and murdered, the remaining Jews began to build bunkers and smuggle weapons and explosives into the ghetto. The left-wing Jewish Combat Organization (ŻOB) and right-wing Jewish Military Union (ŻZW) formed and began to train. A small resistance effort to another roundup in January 1943 was partially successful and spurred the Polish groups to support the Jews in earnest.
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