Certainly, ISU-152 became greatly feared by German heavy tank crews. Like on 14 March 1945 in Hungary, twentyfour dug-in ISU-152 (protected by a minefield) managed to damage sixteen Tiger II from schwere Panzer-Abteilung 509. Later during the day, two sPz.Abt 509 Tiger II seized the strongpoint, knocking out all twentyfour "beast killers". After five days, all battle damaged Tiger II were repaired and running again. Ironically, only 10 days later, fourteen of these Tigers II had to be destroyed due to lack of fuel (source: Wolfgang Schneider: Tigers in Combat)