 For its final attack on Leningrad , the 4th Panzer Group was reinforced by tanks from Army Group Center . On 8 August , the Panzers broke through the Soviet defenses . By the end of August , 4th Panzer Group had penetrated to within 48 kilometers of Leningrad . The Finns had pushed southeast on both sides of Lake Ladoga to reach the old Finnish @-@ Soviet frontier . 
