Bolsheviks had many enemies: The social revolutionaries, supporters of the provisional, supporters of the tsar, army officers and the nobles whose lands had been given to the peasants.

 
The second cause was the czech legion: Czech prisoners of war who mutinied, took control of the Siberian Railway, and attacked towards Moscow.

 
Britain, America and France, angry that Russia had dropped out of the First World War, attacked the Bolsheviks. They were afraid because the Bolsheviks wanted to cause communist revolutions all over the world.

 
there was bound to be a challenge to the Bolsheviks, who had seized power by a surprise coup d’état. After 1918, their political opponents tried to reverse it.

 
enin made peace with Germany (the Treaty of Brest-Litovsk, in which Russia had lost much of Russia’s best agricultural and industrial land to Germany, including Ukraine, Estonia, Latvia and Lithuania) and the former army officers were angry about this.

 
However, when it met in 1918, Lenin used the Red Guards to close the Assembly, and killed anybody who objected. The Social Revolutionaries fought back by attacking the Bolshevik government. The Bolsheviks were also opposed by the Mensheviks (who had controlled the Provisional Government, and who they had toppled from control of the Soviets in September), and by the Tsarists (who wanted to rescue Nicholas II and put him back on the throne).

 
hese were some Czech prisoners of war being taken across Russia who in 1918 mutinied, took control of the Trans-Siberian Railway, and attacked towards Moscow.
Finally, these groups within Russia were helped by the Great Powers, angry that Russia had dropped out of the First World War.

 
hey were afraid because the Bolsheviks believed in World Revolution – the Bolsheviks set up the Comintern, led by Zinoviev, which said it would cause communist revolutions all over the world. Consequently, the Allies sent armies to destroy the Bolsheviks – British, American and French armies attacked from Archangel, Ukraine, and Vladivostock.

 
So foreign countries (also angry because Russia had dropped out of World War I) sent armies to destroy the Bolsheviks – British, American and French armies attacked from Archangel, Ukraine, and Vladivostock.