Riots and strikes over the scarcity of food erupt in Petrograd (now St. Petersberg). The revolution didn´t actually happen in January because of the Julian calendar. 90,000 men and women were on strike and the mobs sometimes clashed with and destroyed police stations.
The Russian army became frustrated at Petrograd and switched their support to the demonstrators. This caused the imperial government to resign and a provisional government was established. Also, as the Russian army deteriorated, there was a shortage of ammuntition, equipment, and medical supplies.
The majority of Russians in the revolution were peasants and industrial workers and did not support the new government. There were many slaughtered soldiers during WWI, but the October Revolution provided an alternative to interest the common people and produce a communist eutopia.