Sir Ian Kershaw is among those historians who believe that the Soviet forces committed a massacre at Nemmersdorf , although details and numbers are disputed . The German Federal Archives ( Bundesarchiv ) contain many contemporary reports and photographs by officials of Nazi Germany of the victims of the Nemmersdorf massacre . It holds evidence of other Soviet massacres in East Prussia , notably Metgethen . In the late 20th century , Alfred de Zayas interviewed numerous German soldiers and officers who had been in the Nemmersdorf area in October 1944 , to learn what they saw . He also interviewed Belgian and French POWs who had been in the area and fled with German civilians before the Russian advance . De Zayas incorporated these sources into two of his own books , '' Nemesis at Potsdam '' and '' A Terrible Revenge ''
Metgethen
Metgethen massacre
Nemmersdorf massacre