Between 1941 and 1944, the USSR and Germany were doing heavy fighting, and Germany almost got to Moscow, but in 1944, Russia started making major comebacks against the Germans after winning the battle of Leningrad, Stalingrad, and the battle of Moscow. (Just in case people don't get it at first. For the Wiki page for the invasion of Russia during WW2, look here https://en.wikipedia.org/wiki/Operation_Barbarossa)