HSwMS Sjölejonet was the lead ship of a class of nine naval submarines in the service of the Swedish Navy from just before World War II into the early Cold War. The submarines were ordered in response to the rising German threat to the south in the interwar period. Sjölejonet remained in service until 1959 and was sold for scrap in 1962.
Klas Horn was originally the Kazarski-class torpedo gunboat Posadnik of the Imperial Russian Navy. One of three built for the Russian Baltic Fleet, Posednik was used as a despatch vessel during World War I. During the Russian Revolution, Finland declared independence from the Russian Empire and the ship, which lay abandoned in Finnish waters, was taken over by the newly formed Finnish Navy and renamed Klas Horn, after a 16th-century admiral. Klas Horn ended her Finnish Navy service in the 1930s. The ship was broken up for scrap in 1938.
Matti Kurki was originally the Kazarski-class torpedo gunboat Voevoda of the Imperial Russian Navy. One of three built for the Russian Baltic Fleet, Voevoda was used as a despatch vessel during World War I. During the Russian Revolution, Finland declared independence from the Russian Empire and the ship, which lay abandoned in Finnish waters, was taken over by the newly formed Finnish Navy and renamed Matti Kurki, after 13th-century commander. Matti Kurki ended her Finnish Navy service in the 1930s. The ship was broken up for scrap in 1938.
The Glauco class was a pair of submarines ordered by the Portuguese government, but were taken over and completed for the Regia Marina during the 1930s. They played a minor role in the Spanish Civil War of 1936–1939 supporting the Spanish Nationalists.
The Hurja-class motor torpedo boats or H class was an Italian-designed class of Finnish motor torpedo boats, seeing service with the Finnish Navy during World War II. The five boats of the H class were built by Cantieri Baglietto in Genoa, Italy. The ships were converted into patrol boats in 1949, in accordance with the Paris peace treaty and their torpedo armament, forbidden by the treaty, was removed. The H class were stricken from the naval vessel register in 1963.
The Taisto-class motor torpedo boats or T class was a series of motor torpedo boats, which saw service with the Finnish Navy during World War II. Following the war, the Paris Peace Treaty of 1947 prohibited the Finnish Navy from employing torpedo-carrying vessels of any kind and the Taisto class were converted into motor gunboats. By 1964, all vessels of the class had been removed from service.
The Balilla class were the first submarines to be built for the Italian navy following the end of World War I. They were large ocean-going cruiser submarines designed to operate in the Indian Ocean based in Italy's East African colonies. The design was double-hulled and based on the German Type UE 2 U-boats, one of which, U-120 was supplied to the Italians as a war reparation. A 425 horsepower (317 kW) auxiliary diesel engine was installed as an extra generator.
The Ruotsinsalmi-class minelayers were a two-strong class of minelayers in the Finnish Navy. The two ships, comprising Ruotsinsalmi and Riilahti, were constructed in Finland and saw service in the Winter War and World War II. Riihahti was sunk in an engagement with Soviet motor torpedo boats on 23 August 1943. Ruotsinsalmi survived the wars and remained in service in the post war Finnish Navy until being withdrawn in the 1970s.
The Pegaso class was a class of 18 Italian sea-going steam-powered torpedo boats built between 1904 and 1909. They served in the Italo-Turkish War and the First World War, when one was sunk, and continued in use until the 1920s.
The Nembo class was a class of destroyer of the Italian Regia Marina. Six destroyers were built by the Pattison shipyard of Naples between 1899 and 1905, to a design based on the contemporary destroyers of the British shipyard Thornycroft. They were active in the Italo-Turkish War and in the First World War, where three were lost.
The Sirio class was a class of six sea-going steam-powered torpedo boats of the Italian Regia Marina built by the German shipyard Schichau-Werke from 1904–1906. They served in the Italo-Turkish War and the First World War.
The Orione class was a class of four sea-going steam-powered torpedo boats of the Italian Regia Marina built by the Odero shipyard of Sestri Ponente from 1905 to 1907. They served in the Italo-Turkish War and the First World War.
The Orjen class of eight motor torpedo boats was built for the Royal Yugoslav Navy between 1936 and 1939 at the Lürssen Shipyard at Vegesack, Germany. They were based on the German S-2 motor torpedo boats. At the start of the Axis invasion of Yugoslavia, two boats managed to escape to Alexandria in Egypt where they continued serving with Allied forces, including in operations against Vichy French forces in Syria. The remaining ones were captured by Italian forces and commissioned in the Regia Marina with modified armament; they were also used by the Italians as the model for the Italian-built CRDA 60 t motor torpedo boats.
Foca was the lead ship of her class of three submarine minelayers built for the Regia Marina during the late 1930s.
The Settembrini class was a pair of submarines built for the Regia Marina during the late 1920s. They played a minor role in the Spanish Civil War of 1936–1939 supporting the Spanish Nationalists.
The Pisani-class submarines were built for the Regia Marina during the late 1920s. They played a minor role in the Spanish Civil War of 1936–1939 supporting the Spanish Nationalists.
Narvalo was one of four Squalo-class submarines built for the Regia Marina during the late 1920s. The boat served in World War II and was sunk in 1943 by British destroyers and aircraft.
The Bragadin-class submarines were built for the Regia Marina during the late 1920s. Both boats participated in the Second World War and were discarded in 1948.
Marcantonio Bragadin was the lead ship of her class of two submarines built for the Regia Marina during the late 1920s. The boats participated in the Second World War and was discarded in 1948.
Filippo Corridoni was one of two Bragadin-class submarines built for the Regia Marina during the late 1920s. The boat participated in the Second World War and was discarded in 1948.
