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Partisans were fighters in irregular military groups participating in the Jewish resistance movement against Nazi Germany and its collaborators during World War II.
A number of Jewish partisan groups operated across Nazi-occupied Europe, some made up of a few escapees from the Jewish ghettos or concentration camps, while others, such as Bielski partisans, numbered in the hundreds and included women and children.
Many individual Jewish fighters also took part in the other partisan movements in other occupied countries. In all, the Jewish partisans numbered between 20,000 and 30,000.
The partisans engaged in guerrilla warfare and sabotage against the Nazi occupation, instigated ghetto uprisings and freed prisoners. In Lithuania alone, they killed approximately 3,000 German soldiers. They sometimes had contacts within the ghettos, camps, Judenrats, and with other resistance groups, with whom they shared military intelligence.
The Jewish partisans had to overcome great odds in acquiring weapons, food, shelter and evading capture. They typically lived in underground dugouts called zemlyankas (Russian: землянка) and camps in the forests.
Nazi reprisals were brutal, as they employed collective punishment against their supporters and the ghettos from which partisans had escaped, and often used "anti-partisan actions" as a guise for the extermination of Jews.
The partisans operated under constant threat of starvation. Those who managed to flee the ghettos and camps had nothing more than the clothes on their backs and their possessions often were reduced to rags through constant wear.
The forests also concealed family camps where Jewish escapees from camps or ghettos, many of whom were too young or too old to fight, hoped to wait out the war. While some partisan groups required combat readiness and weapons as a condition for joining, many noncombatants found shelter with Jewish fighting groups and their allies. These individuals and families contributed to the welfare of the group by working as craftsmen, cooks, seamstresses and field medics.