The Bolsheviks won the civil war due in no small measure to the hierarchical,disciplined military machine of 5 million men created by the new commissar of war:

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As the new commissar of war, Leon Trotsky played a significant role in organizing and leading the Red Army during the Civil War. Trotsky transformed the disjointed and disorganized Red Army into a formidable fighting force of 5 million men. He also introduced new tactics and strategies, such as the use of armored trains and mobile warfare, which gave the Red Army a strategic advantage over the White Army. Trotsky's leadership and organizational skills were critical to the Bolsheviks' victory in the Civil War.

The Bolsheviks Won the Civil War Due in No Small