The Otranto Barrage was an Allied naval blockade of the Strait of Otranto between Brindisi in Italy and Corfu on the Greek side of the Adriatic Sea in the First World War. The blockade was intended to prevent the Austro-Hungarian Navy from escaping into the Mediterranean and threatening Allied operations there. The blockade was effective in preventing surface ships from escaping the Adriatic, but it had little or no effect on the submarines based at Cattaro.
SMS Sankt Georg was the third and final armored cruiser of the Austro-Hungarian Navy. She was built at the Pola Arsenal; her keel was laid in March 1901, she was launched in December 1903, and completed in July 1905. Her design was based on the previous armored cruiser Kaiser Karl VI, with the primary improvement being a stronger armament. Sankt Georg, named for Saint George, was armed with a main battery of two 24-centimeter (9.4 in) guns, five 19 cm (7.5 in) guns, and four 15 cm (5.9 in) guns.
The First Battle of Durazzo was a naval battle of World War I. It was fought off Durazzo, Albania at the end of December 1915 and involved the navies of Austria-Hungary, the United Kingdom, Italy, and France.
The Adriatic Campaign of World War I was a naval campaign fought between the Central Powers and the Mediterranean squadrons of Great Britain, France, the Kingdom of Italy, Australia, and the United States.
SMS Novara was a Novara-class scout cruiser of the Austro-Hungarian Navy which served during World War I. Built by the Danubius shipyard between December 1912 and January 1915, Novara was the third and final member of her class to enter service, some six months after the start of the war. She was armed with a battery of nine 10-centimeter (3.9 in) guns and had a top speed of 27 knots.
SM U-4 or U-IV was a U-3-class submarine or U-boat built for and operated by the Austro-Hungarian Navy before and during the First World War. The submarine was built as part of a plan to evaluate foreign submarine designs, and was the second of two boats of the class built by Germaniawerft of Kiel, Germany.
The Battle of the Strait of Otranto of 1917 was the result of an Austro-Hungarian raid on the Otranto Barrage, an Allied naval blockade of the Strait of Otranto. The battle took place on 15 May 1917, and was the largest surface action in the Adriatic Sea during World War I. The Otranto Barrage was a fixed barrier, composed of lightly armed drifters with anti-submarine nets coupled with minefields and supported by Allied naval patrols.
SM U-27 or U-XXVII was the lead boat of the U-27 class of U-boats or submarines for the Austro-Hungarian Navy. U-27 was built by the Austrian firm of Cantiere Navale Triestino (CNT) at the Pola Navy Yard and launched on 19 October 1916. She was commissioned on 24 February 1917.
Nino Bixio was a protected cruiser built by the Italian Regia Marina in the early 1910s. She was the lead ship of the Nino Bixio class, which were built as scouts for the main Italian fleet. She was equipped with a main battery of six 120-millimeter (4.7 in) guns and had a top speed in excess of 26 knots, but her engines proved to be troublesome in service. Nino Bixio saw service during World War I and briefly engaged the Austro-Hungarian cruiser SMS Helgoland in 1915. Her career was cut short in the post-war period due to severe cuts to the Italian naval budget, coupled with her unreliable engines. Nino Bixio was stricken from the naval register in March 1929 and sold for scrap.
Marsala was a protected cruiser built by the Italian Regia Marina in the 1910s. She was the second and final member of the Nino Bixio class, which were built as scouts for the main Italian fleet. She was equipped with a main battery of six 120-millimeter (4.7 in) guns and had a top speed in excess of 26 knots, but her engines proved to be troublesome in service. Marsala spent World War I based at Brindisi; she was involved in the Battle of the Otranto Straits in May 1917, where she briefly engaged Austro-Hungarian cruisers. Marsala's career was cut short in November 1927 when she was stricken from the naval register and sold for scrap, the result of her unreliable engines and drastic cuts to the naval budget.
Quarto was a unique protected cruiser built by the Italian Regia Marina in the 1910s. Her keel was laid in November 1909, she was launched in August 1911, and was completed in March 1913. She was the first Italian cruiser to be equipped with steam turbines, which gave her a top speed of 28 knots. Her high speed was a requirement for the role in which she was designed to serve: a scout for the main Italian fleet.
SMS Saida was a Novara-class scout cruiser built for the Austro-Hungarian Navy in the early 1910s. The ship was armed with a main battery of nine 10 cm (3.9 in) guns, and six twin 53.3 cm (21.0 in) torpedo tubes were added in 1917. She was built by the Cantiere Navale Triestino shipyard from 1911 to 1914, entering service days after the outbreak of World War I. She spent the war as a flotilla leader, conducting raids and patrols in the narrow waters of the Adriatic Sea.
The 250t class were high-seas torpedo boats built for the Austro-Hungarian Navy between 1913 and 1916. A total of 27 boats were built by three shipbuilding companies, with the letter after the boat number indicating the manufacturer. There were small variations between manufacturers, mainly in the steam turbines used, and whether they had one or two funnels. The eight boats of the T-group, designated 74 T – 81 T, were built by Stabilimento Tecnico Triestino, located at Triest. The sixteen boats of the F-group, 82 F – 97 F, were built by Ganz-Danubius at their shipyards at Fiume and Porto Re. The three M-group boats, 98 M – 100 M, were manufactured by Cantiere Navale Triestino at Monfalcone.
Bisson was the name ship of her class of destroyers built for the French Navy during the 1910s, entering service in 1913. She served in the Mediterranean Sea during the First World War, sinking the Austro-Hungarian submarine U-3 on 6 July 1915 and took part in the Battle of Durazzo in December 1915 and the Battle of the Strait of Otranto in May 1917. She was stricken in 1933 and scrapped in 1939.
The Novara class was a class of three scout cruisers built for the Austro-Hungarian Navy. Named for the Battle of Novara, the class comprised SMS Saida, SMS Helgoland, and SMS Novara. Construction started on the ships shortly before World War I; Saida and Helgoland were both laid down in 1911, Novara followed in 1912. Two of the three warships were built in the Ganz-Danubius shipyard in Fiume; Saida was built in the Cantiere Navale Triestino shipyard in Monfalcone. The Novara-class ships hold the distinction for being the last cruisers constructed by the Austro-Hungarian Navy.
SMS Admiral Spaun was a scout cruiser built for the Austro-Hungarian Navy. Named for Admiral and Marinekommandant Hermann von Spaun, Admiral Spaun was constructed shortly before World War I. Laid down at the Pola Navy Yard in May 1908, the cruiser was launched in October 1909. Admiral Spaun was commissioned into the Navy just over a year later, in November 1910. The first ship of the Austro-Hungarian Navy to be constructed with steam turbines, her design later influenced the construction of the Novara-class cruisers.
SMS Orjen was one of six Tátra-class destroyers built for the kaiserliche und königliche Kriegsmarine shortly before the First World War. Completed in 1914, she helped to sink an Italian destroyer during the action off Vieste in May 1915 after Italy declared war on Austria-Hungary. Two months later the ship participated in an unsuccessful attempt to recapture a small island in the central Adriatic Sea from the Italians. In November and early December Orjen was one of the ships conducting raids off the Albanian coast to interdict the supply lines between Italy and Albania, although she did not participate in the First Battle of Durazzo in late December. Orjen participated in several raids on the Otranto Barrage in 1916–1917 with limited success. She was transferred to Italy in 1920 in accordance with the peace treaties ending the war and renamed Pola. She mostly served as a training ship or in Italian North Africa when she was not in reserve from 1924 to 1928. Renamed Zenson in 1931, the ship was scrapped in 1937.
SMS Csepel was one of six Tátra-class destroyers built for the kaiserliche und königliche Kriegsmarine shortly before the First World War. Completed in 1913, she helped to sink an Italian destroyer during the action off Vieste in May 1915 after Italy declared war on Austria-Hungary. Two months later the ship participated in an unsuccessful attempt to recapture a small island in the central Adriatic Sea from the Italians. In November and early December Csepel was one of the ships conducting raids off the Albanian coast to interdict the supply lines between Italy and Albania. She was hit one time during the First Battle of Durazzo in late December. Her stern was blown off by a French submarine in early 1916 and her repairs were not completed until early 1917.
SMS Balaton was one of six Tátra-class destroyers built for the kaiserliche und königliche Kriegsmarine shortly before the First World War. Completed in 1913, she did not participate in the attacks on the Italian mainland after Italy declared war on Austria-Hungary in May 1915. Two months later the ship bombarded a small island in the Central Adriatic Sea during an unsuccessful attempt to recapture it from the Italians. In November and early December Balaton was one of the ships conducting raids off the Albanian coast to interdict the supply lines between Italy and Albania. She played a minor role in the 1st Battle of Durazzo in late December. Balaton participated in several unsuccessful raids on the Otranto Barrage in 1917, although she sank an ammunition ship during the Battle of the Strait of Otranto. She was transferred to Italy in 1920 in accordance with the peace treaties ending the war and renamed Zenson. The Regia Marina used her for spare parts; she was discarded in 1923 and subsequently scrapped.
SMS Tátra was the lead ship of her class of six destroyers built for the kaiserliche und königliche Kriegsmarine shortly before the First World War. Completed in 1913, she helped to sink an Italian destroyer during the action off Vieste in May 1915 after Italy declared war on Austria-Hungary. Two months later the ship participated in an unsuccessful attempt to recapture a small island in the Central Adriatic Sea from the Italians. In November and early December Tátra was one of the ships conducting raids off the Albanian coast to interdict the supply lines between Italy and Albania. During the early stages of the 1st Battle of Durazzo in late December, the ship was tasked to tow her one of her sister ships that had been crippled by a mine. She was forced to abandon her sister when the Austro-Hungarians were spotted by a strong force of Allied ships and had to evade their pursuit. Tátra participated in several unsuccessful raids on the Otranto Barrage in 1917. She was transferred to Italy in 1920 in accordance with the peace treaties ending the war and renamed Fasana. The Regia Marina used her for spare parts; she was discarded in 1923 and subsequently scrapped.
Austria-Hungary 
Italy 
