The 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 the White Army and other factions. The Red Army was known for its discipline and organization, which helped it secure victories and expand the influence of the Bolshevik 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 like the Battle of Stalingrad. The Red Army's efforts contributed significantly to the eventual victory of the Allies in the war.