By the outbreak of World War I, the Russian Baltic Fleet, with its four pre-dreadnought battleships, was outmatched in size by the German fleet, which possessed thirteen of the latest dreadnoughts along with other ships. Using mainly minefields and coastal batteries, the Russian Navy was assigned the special task of protecting the Gulf of Finland. Mines were planted on the very eve of the declaration of war, 18 July 1914. Due to the persistence and energy of Admirals Nikolay Essen and Viktor Ka-nin, a minelaying detachment under the latter's command laid 2,124 mines in only four hours, thus barring the entrance to the Gulf of Finland. However, the German Command concentrated its main forces against the British in the North Sea, restricting itself in the Baltic to occasional operations by its force of cruisers-raids that were, for the most part, unsuccessful. http://www.neva.ru/EXPO96/book/chap11-2.html
