Many Jews throughout German-occupied Europe attempted armed resistance against the Nazis. As individuals or in groups, Jews engaged in planned or spontaneous opposition to the Germans and their allies. Jewish partisans were especially active in the east, where they fought the Germans from bases established behind the front lines in forests and ghettos. Because anti-Semitism was widespread there, they found little support among the surrounding population. Even so, as many as 20,000 Jews fought the Germans in the forests of eastern Europe.
Sources: U.S. Holocaust Memorial Museum