The Bolsheviks (proletariats or base of the revolution) desperately wanted out of the war as the people were already strained and starving before the war and it got even worse during the war, basically the people wanted the main attention to be at solving the nations problems- which kinda caused the Bolsheviks to rebel and then sign the Treaty of Brest-Litovsk ( gave Germany Russian land to allow Russia to leave the war)
