Voima was a Finnish and later Soviet steam-powered icebreaker. Laid down at Werft Becker & Co. in Tallinn in 1916 and fitted with engines in Danzig in 1918, the unfinished icebreaker was towed to Helsinki in 1920 and completed by Sandvikens Skeppsdocka och Mekaniska Verkstads Ab in 1923–1924. After two decades of successful service Voima was handed over to the Soviet Union as war reparation in 1945 and renamed Malygin (Малыгин). She remained in service until 1970 and was broken up in 1971.

The 120 mm 50 caliber Pattern 1905 was a Russian naval gun developed by Vickers for export in the years before World War I that armed a variety of warships of the Imperial Russian Navy. Guns salvaged from scrapped ships found a second life as coastal artillery, railway artillery and aboard river monitors during the Russian Civil War. It was estimated that there were 110 guns in the Soviet Navy's inventory in 1941. Of these, 39 were in the Baltic Fleet, 20 in the Black sea Fleet, 24 in the Amur Flotilla, 11 in the Pacific Fleet and 6 in the Pinsk flotilla in World War II.