The Bielski partisan leaders split the group into two units, one named "Ordzhonikidze", led by Zus, and the other "Kalinin", commanded by Tuvia. Fighting on the Soviet side, they took part in fights between Polish and Soviet forces. On 1 December 1943, they helped the Soviets disarm a group of Polish partisans. According to records kept by the partisans, the Bielski fighters from both units claimed to have killed a total of 381 enemy fighters, sometimes during joint actions with Soviet groups.