Answer:
From what I remember, it was a revolution that overthrew the Czar and the government. The Czar wasn't very popular after the first world war, they lost a lot of people. The German's sent a radical named Vladimir Lenin back to Russia to get the Russians in a civil war. Backed by the Germans and the disapproval of the Czar, it wasn't hard for the people to listen to the "man of the people" Lenin and eventually overthrow the government.