Battalion covered the retreat from Russia and was deployed to Warsaw after the onset of the Uprising 1944 to fight with the Dirlewanger unit. There and in subsequent engagements with the Red Army, it suffered heavy casualties, and surviving soldiers of II./Bergmann, together with Azeri from another Wehrmacht unit (I./111), formed the III. Battalion of the new Grenadier-Regiment 1607 (27 March 1945).