It had a total of 39 (instead of the full complement of 45) Tiger IIs and was loaded onto trains on 27 January 1945, and sent to the Eastern Front in the Army Group Vistula sector. By 15 April 1945, the 503rd reported a total of 12 Tiger IIs, of which 10 were still operational. The 503rd ended the war fighting in the Battle of Berlin as part of Kampfgruppe Mohnke.