When the Bolsheviks secured control of the Petrograd Soviet, Trotsky was elected as leader and this became the key to his success.
In October, he became the dominant member of the three-man Military Revolutionary Committee of the Soviet.
The MRC controlled 20,000 Red Guards, 60,000 Baltic sailors and the 150,000 soldiers of the Petrograd garrison.
When Bolsheviks started to prepare for revolution, they began to rely on small, disciplined units of soldiers and workers.
From his office, Trotsky made plans for the seizure of the key buildings of the PG and their overthrow of the PG.