Stalin's Red Army entered World War II as a relatively untried fighting force. In 1941, with the launch of Operation Barbarossa, it joined battle with Hitler's army, the most powerful in history. After a desperate war of attrition lasting more than four years, the Red Army beat the Nazis into submission on the Eastern Front and won lasting fame and glory in 1945 by eclipsing the military might of the Third Reich. From the army's development prior to the outbreak of war in 1939 to its peak in 1945, every aspect of its force is examined here: the organizational structures, combat arms infantry, amour and mechanized forces, cavalry, airborne, and special forces. A technical overview of infantry weapons, armored vehicles, artillery, and support equipment is also provided. Fully illustrated with a comprehensive selection of archive photographs, charts, and tables of organization, this is a useful source of reference for anyone interested in the armies of World War II.