How did the Bolsheviks take power in Russia?

During the 'Revolution of 1917' in Russia, the 'Bolsheviks' (or, Communists) took power through a combination of methods and actions. As just one example, they were very well organized and zealously committed to their cause, which could not be said of the majority of their enemies in the revolution. As another, they took advantage of the wide-spread peasant resentment against the ruling dynasty of Russia to increase their strength considerably.