Adolf Hitler invaded the Soviet Union in June, 1941, and his armies raced eastward like a juggernaut until the Red Army and the Russian winter stalled them -- especially at Moscow and Leningrad.
The siege of Leningrad lasted nearly 2-1/2 years. The city was isolated and nothing got in or out except by way of a roadway over frozen Lake Ladoga when there was ice. People survived on a ration of bread that was as much sawdust as flour. They ate pets, the zoo animals, leather goods ,and worse. The death, destruction, and suffering were beyond all description.