The Soviet Red Army was the military force of the Soviet Union, established after the Russian Revolution in 1917. It played a crucial role in the Russian Civil War, fighting against various anti-Bolshevik groups. The Red Army was known for its large size and the use of political commissars to ensure loyalty to the Communist Party. During World War II, the Red Army became one of the largest and most powerful military forces in the world. It was instrumental in defeating Nazi Germany, particularly during key battles such as the Battle of Stalingrad. The Red Army's efforts contributed significantly to the eventual victory of the Allies in the war.