What was the first method of defense the Soviet Union used?

Answer: military history of the Soviet Union began in the days following the 1917 October Revolution that brought the Bolsheviks to power. In 1918 the new government formed the Red Army, which then defeated its various internal enemies in the Russian Civil War of 1917-22. The years 1918-21 saw defeats for the Red Army in the Polish-Soviet War (1919-21) and in independence wars for Estonia (1918-20), Latvia (1918-20) and Lithuania (1918-19). History of the Soviet Union (1982-91).