World War II: Soviet forces liberate the Łódź Ghetto. Of more than 200,000 inhabitants in 1940, fewer than 900 had survived the Nazi occupation.

The Workers' and Peasants' Red Army, often referred by its shortened name as the Red Army, was the army and air force of the Russian Soviet Republic and, from 1922, the Soviet Union. The army was established in January 1918 by a decree of the Council of People's Commissars to oppose the military…