When Germany attacked the Soviet Union in June 1941, many district governments took the initiative to begin a partial scorched-earth policy to deny the invaders access to electrical, telecommunications, rail, and industrial resources. Parts of the telegraph network were destroyed, some rail and road bridges were blown up, most electrical generators were sabotaged through the removal of key components, and many mineshafts were collapsed. The process was repeated later in the war by the German forces of Army Group North and Erich von Manstein's Army Group Don, which stole crops, destroyed farms, and razed cities and smaller settlements during several military operations. The rationale for the policy was that it would slow pursuing Soviet forces by forcing them to save their own civilians, but in Manstein's postwar memoirs, the policy was justified as to have prevented the Soviets from stealing food and shelter from their own civilians. The best-known victims of the German scorched-earth policy were the people of the historic city of Novgorod, which was razed during the winter of 1944 to cover Army Group North's retreat from Leningrad.