After seizing control of Russia from the Provisional Government, the Bolsheviks had to safeguard their fragile grip on the reins of power.
Lenin negotiated peace with Germany and therefore an end to Russia's role in World War One. However he could not avoid a civil war.
The Russian Civil War raged from 1918 until the start of 1921. During this time, the Bolsheviks faced massive opposition to their rule in the form of the White Armies, led by former officers of the Tsarist state, and also from intervention by the forces of foreign countries. Yet, by the start of 1921, the Bolsheviks had defeated their enemies and gained a complete victory.
The Bolsheviks were extremely fortunate in the quality of their leadership, particularly in Lenin and Trotsky. Throughout the Civil War, Lenin provided the energy and drive needed to inspire success, while Trotsky provided the organisation and charisma.
Trotsky became Commissar for War in the Bolshevik government in March 1918. A brilliant organiser and improviser, Trotsky created the Red Army out of the Red Guards and from the remnants of the old Tsarist army.
Trotsky travelled in an armoured train to the front lines to encourage troops. At times of crisis, he readily assumed personal command of areas under threat. He successfully inspired and encouraged troops to greater efforts, and to eventual victory.
Under Lenin's leadership, the Bolsheviks displayed total ruthlessness in making sure that they did not face rebellion and revolt in the areas they controlled, assuming the role as the true nationalists and representative of Russian people.
The Bolsheviks organised a highly effective propaganda campaign dispersed through posters, leaflets, cinema and speeches.
Propanganda told the people that living conditions would improve and wealth would be distributed more fairly. In contrast they warmed that the White Armies and their leaders would destroy all the achievements of the Revolution, break up the Soviets and bring back the old system.
The Bolsheviks portrayed themselves as a patriotic party who would defend Russia from imperialists. This was particularly effective since the Whites had support from Britain, France and the USA.
The Bolsheviks spread the fear that Russia would be taken over by foreign countries and absorbed into their empires.