During the civil war which followed the Russian Revolution, Russia's naval power in the Baltic was reduced to insignificance. The Baltic Fleet lost the political confidence of the Government as a result of the Kronstadt mutiny of 1921, and its material and moral degenerated further in the confusion and chaos of the times.
Rau, Erwin M.
"Russia and the Baltic Sea: 1920-1970,"
Naval War College Review: Vol. 23
, Article 4.
Available at: http://digital-commons.usnwc.edu/nwc-review/vol23/iss7/4