How did Leon Trotsky help win the Russian Civil War?

After the October Revolution put the Bolsheviks in power, civil war broke out to remove them. Leon Trotsky was made People's Commissar of War and given the task of creating an army to fight against the other side. Trotsky was responsible for organizing the Red Army from Bolshevik militia, army units that supported the Bolsheviks and others into an effective fighting force. He was also good at strategy and tactics in the war. He traveled by armored train from one place to another to direct operations in those areas as needed. He is credited with being the main reason the Red forces defeated the opposing White forces rather than just being a help to win the civil war.