The Albona class were mine warfare ships used by the Italian (Royal Navy) and Royal Yugoslav Navy (; KM). Fourteen ships were originally laid down between 1917 and 1918 for the Austro-Hungarian Navy as the MT.130 class. However, the end of World War I and the dissolution of Austria-Hungary left them incomplete until 1920, when three ships were finished for the . These ships were armed with two guns. An additional five ships were completed for the KM in 1931 as the Malinska or Marjan class, and were armed with a single gun. All of the completed ships could carry 24 to 39 naval mines. The remaining ships were never completed.
The five ships in KM service were captured by Italian forces during the Axis invasion of Yugoslavia and commissioned in the Regia Marina as the Arbe class, and were re-armed with two 76 mm guns. They were involved in some operations against the Yugoslav Partisans along the Dalmatian coast. Following the Italian surrender in September 1943, the three Albona-class ships were captured by German forces with all three being lost or scuttled later in the war. Of the five former KM ships, one was seized and operated by the (German Navy) until it was lost. Another was captured but transferred to the navy of the German puppet Italian Social Republic, and scuttled by the Germans towards the end of the war. The remaining three were returned to the KM-in-exile at Malta in late 1943 and swept for mines around Malta until transferred to the new Yugoslav Navy (; JRM) in August 1945.
After the war, the three ships were commissioned into the JRM and their designations were changed several times. In October 1946, two of them were involved in the Corfu Channel incident, an early clash in the developing Cold War, when they laid mines in the Straits of Corfu at the request of the People's Socialist Republic of Albania. The undeclared minefield damaged two British destroyers, killing 44 men and injuring another 42. The incident resulted in a case before the International Court of Justice and a fifty-year diplomatic freeze between Albania and the UK, and Yugoslavia never conceded that its ships had laid the mines. The three remaining ships were stricken from the navy list in 1962 and 1963.
Background The Austro-Hungarian Navy was relatively slow to acquire specialist mine warfare vessels. It mainly utilised destroyers and torpedo boats for these tasks, but during World War I it ordered several classes of small mine warfare vessels, some of which were completed before the end of the war. A class of larger mine warfare ships was ordered from the Ganz & Danubius shipyard at Porto Re (now Kraljevica). A total of fourteen ships were laid down between October 1917 and September 1918 as the MT.130 class. They were originally designed as minelayers, but the navy ordered the first six completed as minesweepers. All were eventually fitted for minesweeping during construction. By September 1918, only the first three had been launched, and even they had not been fully completed. The end of World War I and the dissolution of Austria-Hungary left the ships in various stages of completion, the shipyard itself now part of the newly formed Kingdom of Serbs, Croats and Slovenes (renamed Yugoslavia in 1929). With the creation of the new kingdom, the Ganz & Danubius shipyard became .
Description and construction The ships had a raised forecastle on which a gun was to be mounted. The Austro-Hungarian design called for a L/44 gun, but the actual guns that were fitted when the ships were completed varied between those completed for the Italian Regia Marina (Royal Navy) and those completed later for the Royal Yugoslav Navy (; KM). Aft of the gun on the rear section of the forecastle were arranged the captain's cabin on the starboard side and the pantry on the port side. Between the two was the galley, directly below the enclosed steering bridge, which was topped with an open navigation bridge on which a searchlight was mounted. The foremast with a crow's nest was attached to the forward edge of the navigation bridge. Immediately aft of the bridge was the funnel, which was taller in the original design and on the ships completed for the Regina Marina and shorter on the ships completed for the KM. Aft of the funnel was a wide quarterdeck that reached to the stern where a mine crane was installed. On the ships completed for the KM, a deckhouse for the ship's office was added to the forward section of the quarterdeck and a mainmast was installed in the centre of the quarterdeck. The ships completed for the Regia Marina did not have a deckhouse or mainmast, and a winch was installed in the centre of the quarterdeck. Two ship's boats were secured on davits on either side of the quarterdeck.
Below deck, the bow contained the drinking water tanks, aft of which were cabins for the petty officers on either side of the anchor chain locker. Immediately aft of the petty officers' cabins were the sailors' bunks, and underneath these the boiler water and fuel tanks were located. A transverse bulkhead between the sailors' accommodation spaces provided support for the gun. The engine room containing the boiler and engines was located under the galley and was covered by a low superstructure with ventilation cowls. The engine room was separated from the hold by a bulkhead that supported the deckhouse on the KM ships. A workshop was located in the stern.
The ships of the class had a length overall of , a length between perpendiculars of , a beam of , and a draught of as a minesweeper and as a minelayer. At full load they had a displacement of as a minesweeper, and as a minelayer. They had two vertical triple-expansion steam engines driving one shaft each, with steam provided by a single oil-fired Yarrow boiler. Their engines were rated at , for a maximum speed of , but the ships built for the Regia Marina could only achieve a top speed of . The cruising speed was . Up to of fuel could be carried in the tanks located below the sailor's accommodation. The ships were very maneuverable due to their excellent length-to-beam ratio and the distance between their propellers. The crew consisted of 29 officers and enlisted men.
As none of the ships were completed before the end of World War I, the planned 47 mm guns were not fitted to any of the ships when built. They were also planned to be fitted with one machine gun mounted aft, andwhen completed as minelayersto carry 24–39 mines, with the number depending on the types of mines loaded. The three ships completed for the Regia Marinacomprising the Albona classwere armed with two Ansaldo Model 1915 L/30 guns, two 8 mm machine guns, and could carry 34 mines. The five ships completed for the KM as the Malinska class were initially armed with a single Škoda L/30 gunobtained from former Austro-Hungarian Navy stockand two machine guns, and could carry 24 to 39 mines. The ships completed as minelayers had mine rails fitted to either side of the quarterdeck all the way to the stern. The KM ships later had their 66 mm guns replaced with the originally planned Škoda 47 mm L/44 guns.
The first three ships of the class, MT.130–132, were completed by the shipyard for the Regia Marina in 1920 as RD 58–RD 60, and were then converted to minelayers. On 2 July 1921 they were named the Albona class, and were commissioned as Albona, Laurana and Rovigno, respectively. Albona was named for Italian towns in Istria, Albona, Laurana, and Rovigno. Five other ships, MT.133–137, were completed at the shipyard in 1931 for the KMas the Malinska or Marjan classand were commissioned as Marjan, Mosor, Malinska, Meljine, and Mljet respectively. Marjan was named for a hill near Split, Mosor for a mountain range near Split, Malinska for the town on the Dalmatian island of Krk, Meljine for the town in the Bay of Kotor, and Mljet for the Dalmatian island of that name. The hulls of MT.138–MT.143 were 45 per cent finished by October 1918 but were never completed.
Ships +Ships of class Austro-Hungariandesignation Builder Laid down Launched Completed Completed for Name upon completion (tactical designation)
Service history Albona class The interwar was keen to acquire minelayers, and the Albona class were the first of several classes of mine warfare vessels it obtained. Italy entered World War II in June 1940, at which time, the three Albona-class ships were allocated to the local naval command of the (Upper Adriatic Sector) based in Venice, commanded by (Division Admiral) Ferdinando di Savoia. Between June 1940 and the Axis invasion of Yugoslavia in April 1941, the main Italian fleet operated in the Mediterranean Sea. The Italians considered the Adriatic Sea their "backyard", and did not consider the KM a dangerous opponent. Despite considerable activity by Allied submarines in the Adriatic after June 1940, the Italians continued to use it for training. Between 6 June and 10 July 1940, the three Albona-class ships, along with the Azio and auxiliary minesweeper San Guisto laid 21 defensive minefields in the northern Adriatic, consisting of 769 mines. While British and Greek submarines operated in the Adriatic during this period of the war, Allied submarines laid few mines there, with the only significant work being undertaken by the mine-laying submarine off the Italian port of Ancona and the Yugoslav islands of Premuda and Susak in the northern Adriatic in late January 1941.
In 1941, Laurana was fitted with smoke apparatus to assist in the defence of Venice. By mid-May of that year, Albona and Rovigno had been transferred to Greek waters. Following the Italian Armistice in early September 1943, Albona and Rovigno were captured by the Germans at the island of Syros in the Aegean Sea on 10 September. They were renamed Netztender 57 and Netztender 56 respectively, and their armament was improved. Between 19 July and 4 September 1943, Laurana laid a 70-mine defensive barrage in the Adriatic. Laurana was captured at Venice on 11 September, and was commissioned by the Germans under her Italian name on 30 September, although she was still at Venice and not operational on 10 October, and not ready for service as part of the 11th Security Flotilla of the (German Navy) until after 8 November. She served as a minelayer in the Adriatic with her Italian armament.
Netztender 57 and Netztender 56 were scuttled by the Germans at Salonika on 31 October 1944 as they withdrew from the city, and Laurana was sunk at Trieste by British aircraft bombs on 20 February 1945, and was broken up in 1949.
Malinska class
The Malinska-class ships had a relatively quiet career until 1941, serving as training vessels and minesweepers allocated to the Coast Defence Command. By 1936, the Malinska class were classified as minelayers. On 26 January 1939, Malinska, under the command of (lieutenant commander, junior grade) Aleksandar Berić, suffered boiler failure and was blown by the wind towards the coast south of Dubrovnik. The Sokol, under the command of (Frigate captain) Mirko Pleiweiss, sailed to assist from the Bay of Kotor, and towed her to a secure mooring. At the start of the German-led Axis invasion of Yugoslavia, the five Malinska-class ships were assigned to the Coast Defence Command and spread over three sectors; Malinska in Selce (North Sector), Mosor and Marjan in Šibenik (Central Sector), and Mljet and Meljine in the Bay of Kotor (South Sector). The ships at Šibenik and the Bay of Kotor were captured in port by the Italians without incident.