What are the factors and events that brought lenin to power in 1917

Party Unity, German Aid, the Whites were falling apart, and they were very organized. The idea of Communism/Socialism was very intriguing and people were interested in it, and his party promised prosperity and a lot of things, which sounded very attractive to people. 

WW1 is a big event that brought him to power, to avoid a war with Russia, the Germans sent Lenin and allies with LOTS of money and LOTS of resources.