A British submarine flotilla operated in the Baltic Sea for three years during the First World War.[1] The squadron of nine submarines was attached to the Russian Baltic Fleet. The main task of the flotilla was to prevent the import of iron ore from Sweden to Imperial Germany. The success of the flotilla also forced the German Navy in the Baltic to keep to their bases and denied the German High Seas Fleet a training ground. The flotilla was based in Reval (Tallinn), and for most of its career commanded by Captain Francis Cromie.[2]
The flotilla originally consisted of six E-class and five C-class submarines. The smaller C-class submarines reached the Baltic Sea from the White Sea[3][4] via northern rivers;[5] the long-range E-class submarines managed to enter the German backwaters by passing undetected through the narrow and shallow Danish straits. Two submarines were lost to stranding and one went missing, now presumed sunk by a mine.
A similar fate awaited the flotilla's Russian counterpart. The Ice Cruise of the Baltic Fleet had left four Russian Holland type submarines without support in Hanko. The arrival of German troops under Rüdiger von der Goltz on 3 April forced the Russians to hastily scuttle the submarines—including AG 12 and AG 16—in Hanko harbour.
Submarines
E class
The E-class submarines entered the Baltic Sea through the Danish straits through waters only 10 metres (33 ft) deep. On 19 August 1915, HMS E13 was stranded in The Sound near Saltholm. In a breach of Danish neutrality, she was destroyed by German torpedo boat G132, with a loss of 15 of her crew.[6] The other subs managed to enter the Baltic without being intercepted by the Germans. HMS E18 and E19 made the passage to Reval safely in September 1915.[7]
HMS E9—commanded by Max Horton—intercepted four German steamers on 18–19 October 1915.[8]
HMS E18 was lost in the Baltic Sea in May 1916 while operating out of Reval. Examination of the wreck, discovered off Hiiumaa, Estonia, in 2009, suggests that it struck a mine while sailing on the surface.[9]
HMS E19—commanded by Francis Cromie—intercepted four German steamers on 10–11 October 1915.[10] She also sank the German Gazelle-class warship SMS Undine.
In 1935, the Anglo-German Naval Agreement (AGNA) concluded between Britain and Germany, allowed Germany to increase the size of its navy to one-third the size of the Royal Navy, which would have had the effect of allowing the Kriegsmarine to dominate the Baltic.
Some Finns raised some parts of the scuttled British submarines before World War II but recognized that they were beyond feasible repair and returned them back into the sea.[12] It is believed that the remains were raised in 1953 by the German company Beckedorf Gebryder and used as scrap metal.[11] Wreck of Cicero is believed to have been located in 1995.[13]
Bainton, Roy (2002). Honoured by strangers : the life of Captain Francis Cromie CB, DSO, RN, 1882-1918. Shrewsbury: Airlife. ISBN978-1840371963.
Wilson, Michael (1985). Baltic assignment : British Submariners in Russia 1914-1919. London: Leo Cooper in association with Secker & Warburg. ISBN978-0436578014.