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After the end of the Warsaw Ghetto Uprising Lederman was placed in the Gęsiówka concentration camp. On the fifth day of the Warsaw Uprising Gęsiówka was liberated by a unit led by Wacław Micuta. Henryk Lederman gathered a group of the freed prisoners and presented them to Micuta as a Jewish Battalion ready to fight. He served as a mechanic in the armored platoon headed by Micuta. Shortly thereafter he fought in Old Town where, together with David Goldman he served as a guide through the sewers which he was familiar with since the Ghetto uprising.
He was wounded in later fighting and transported to the insurgent hospital on Drewniana street, in the Riverside district. On September 5 the hospital was taken by German troops and all its patients, including Lederman, were murdered.
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