T1 was a seagoing torpedo boat that was operated by the Royal Yugoslav Navy between 1921 and 1941. Originally 76 T, a 250t-class torpedo boat of the Austro-Hungarian Navy built in 1914, she was armed with two guns and four torpedo tubes, and could carry 10–12 naval mines. She saw active service during World War I, performing convoy, escort and minesweeping tasks, anti-submarine operations and shore bombardment missions. In 1917 the suffixes of all Austro-Hungarian torpedo boats were removed, and thereafter she was referred to as 76. She was part of the escort force for the Austro-Hungarian dreadnought during the action that resulted in the sinking of that ship by Italian torpedo boats in June 1918.
Following Austria-Hungary's defeat later that year, 76 was allocated to the Navy of the Kingdom of Serbs, Croats and Slovenes, which became the Royal Yugoslav Navy, and was renamed T1. At the time, she and seven other 250t-class boats were the only modern sea-going vessels of the fledgling maritime force. During the interwar period, T1 and the rest of the navy were involved in training exercises, but activity was limited by reduced naval budgets. The boat was captured by the Italians during the German-led Axis invasion of Yugoslavia in April 1941. After her main armament was modernised, she served with the Royal Italian Navy under her Yugoslav designation. Having escaped capture by German forces following the Italian capitulation in September 1943, she was returned to the Royal Yugoslav Navy-in-exile. She was commissioned by the Yugoslav Navy after World War II, and after a refit which included replacement of her armament, she served as Golešnica until 1955. She was sunk as a target in Žanjica Bay near the western entrance to the Bay of Kotor, and is now a recreational dive site.
Background In 1910, the Austria-Hungary Naval Technical Committee initiated the design and development of a coastal torpedo boat, specifying that it should be capable of sustaining for 10 hours. At the same time, the committee issued design parameters for a high seas or fleet torpedo boat of , top speed of 30 kn and endurance of . This design would have been a larger and better-armed vessel than the existing Austro-Hungarian s. The specification for the high seas torpedo boat was based on an expectation that the Strait of Otranto, where the Adriatic Sea meets the Ionian Sea, would be blockaded by hostile forces during a future conflict. In such circumstances, there would be a need for a torpedo boat that could sail from the Austro-Hungarian Navy (, ) base at the Bocche di Cattaro (the Bocche or Bay of Kotor) to the strait during the night, locate and attack blockading ships and return to port before morning. Steam turbine power was selected for propulsion, as diesels with the necessary power were not available, and the Austro-Hungarian Navy did not have the practical experience to run turbo-electric boats. Despite having developed these ideas, the Austro-Hungarian Navy then asked shipyards to submit proposals for a boat with a maximum speed of . Stabilimento Tecnico Triestino (STT) of Triest was selected for the contract to build eight vessels, the T group, ahead of one other tenderer. The T-group designation signified that they were built at Triest.
Description and construction The , T-group boats had short raised forecastles and an open bridge, and were fast and agile, well designed for service in the Adriatic. They had a waterline length of , a beam of , and a normal draught of . While their designed displacement was , they displaced about fully loaded. The boats were powered by two Parsons steam turbines driving two propellers, using steam generated by two Yarrow water-tube boilers, one of which burned fuel oil and the other coal. There were two boiler rooms, one behind the other. The turbines were rated at and designed to propel the boats to a top speed of , although a maximum speed of could be achieved. They carried of coal and of fuel oil, which gave them a range of at . The T group had one funnel rather than the two funnels of the later groups of the class. 76 T and the rest of the 250t class were classified as high seas torpedo boats by the Austro-Hungarian Navy, despite being smaller than the original concept for a coastal torpedo boat. The naval historian Zvonimir Freivogel states that this type of situation was common due to the parsimony of the Austro-Hungarian Navy. They were the first small Austro-Hungarian Navy boats to use turbines, and this contributed to ongoing problems with them, which had to be progressively solved once they were in service. The crew consisted of three officers and thirty-eight enlisted men. The vessel carried one yawl as a ship's boat.
The boats were originally to be armed with three Škoda L/30 guns, and three torpedo tubes, but this was changed to two guns and four torpedo tubes before the first boat was completed, to standardise the armament with the F group to follow. A searchlight was mounted above the bridge. The torpedo tubes were mounted in pairs, with one pair mounted between the forecastle and bridge, and the other on a section of raised superstructure above the aft machinery room. They could also carry 10–12 naval mines.
The third of its class to be completed, 76 T was laid down on 24 June 1913, launched on 15 December 1913, completed on 20 July 1914, and commissioned on 23 August. Around the time of her commissioning, one Schwarzlose M.7/12 machine gun was included in the armament of all boats of the class for anti-aircraft work. Four mounting points were installed so that the machine gun could be mounted in the most effective position depending on the expected direction of attack. Until October 1915, the boat was painted black, but from that point it was painted a light blue-grey.
Career World War I Following her commissioning, 76 T was part of the 1st Torpedo Group of the 3rd Torpedo Division of the Austro-Hungarian 1st Torpedo Flotilla. The original concept of operation for the 250t-class boats was that they would sail in a flotilla at the rear of a cruising battle formation, and were to intervene in fighting only if the battleships around which the formation was established were disabled, or in order to attack damaged enemy battleships. When a torpedo attack was ordered, it was to be led by a scout cruiser, supported by two destroyers to repel any enemy torpedo boats. A group of four to six torpedo boats would deliver the attack under the direction of the flotilla commander. As the 250t-class boats came into service, they joined the 1st Torpedo Flotilla, which was initially led by the scout cruiser and later by her sister . The 1st Torpedo Flotilla initially included two divisions of destroyers (1st and 2nd) and a division of torpedo boats (3rd), which the 250t-class boats joined. Throughout the war, 76 T remained with the 3rd Torpedo Division of the 1st Torpedo Flotilla.
Not long after being commissioned, 76 T joined the rest of the 1st Torpedo Flotilla in an attempt to engage part of the French fleet operating in the southern Adriatic on 17 October 1914. The French were sailing in the vicinity of the island of Vis, but departed south during the night of 17/18 October, and the Austro-Hungarian flotilla was unable to launch an attack. On 15 and 16 March 1915, 76 T, along with the old destroyer and 250t-class boats 75 T and 79 T, escorted the newly commissioned dreadnought battleship from the main Austro-Hungarian naval base at Polain the upper Adriaticto the island of Pago to conduct firing exercises. Led by Helgoland, the whole 1st Torpedo Flotilla steamed to the Ionian Sea over the period 11–15 April 1915 in search of the French fleet base, but the operation was unsuccessful.
Italy declared war on Austria-Hungary on 23 May 1915, and hostilities in the Adriatic, which had thus far mostly involved intermittent forays by the French fleet, immediately intensified. Almost the entire Austro-Hungarian fleet left Pola soon after the declaration to deliver an immediate response against Italian cities and towns along the Adriatic coast, aiming to interdict land and sea transport between southern Italy and the northern regions of that country which were expected to be a theatre of land operations. The fleet split into six groups with a range of targets up and down the coast. On 24 May, 76 T participated in this operation, known as the Bombardment of Ancona, which involved shelling of various Italian shore-based targets, with 76 T involved in the operation against Ancona itself, along with two squadrons of battleships, four destroyers, another four 250t-class boats, and thirteen s and six seaplanes. On 27 July, a flotilla led by the scout cruisers and , and escorted by the Huszár-class destroyers and along with 76 T, 75 T and 79 T shelled the Italian railway line between Ancona and Pesaro. During this action, 76 T was engaged by coastal batteries near Ancona and was struck by a shell that failed to explode. In late November 1915, the Austro-Hungarian fleet deployed a force from Pola to the Bocche in the southern Adriatic; this force included six of the eight T-group torpedo boats. This force was tasked to maintain a permanent patrol of the Albanian coastline and interdict any troop transports crossing from Italy. During 1915, in addition to the operations mentioned above, 76 T also conducted three anti-submarine patrols and was often tasked with covering seaplanes returning from bombing missions over Italy.
On 4 January 1916, 76 T laid mines in the Bay of Triest. On 22 February 1916, 76 T, the Kaiman-class boat 70 F, and the 250t-class boats 77 T and 83 F laid a defensive minefield off the Montenegrin port of Antivari. On 3 May, 76 T, along with 92 F, 93 F, 98 M, 99 M and 100 M were accompanying the Huszár-class destroyers , , and Scharfschutze supporting seaplanes returning from an attack on Porto Corsini and Ravenna. During this mission they were involved in a surface action with an Italian force led by the flotilla leaders and accompanied by the s and . On this occasion the Austro-Hungarian force retreated behind a minefield with no damage to the torpedo boats. According to the naval historian Zvonimir Freivogel, although some sources state Csikós sustained splinter damage, this was not the case. In 1917, 76 Ts forward 66 mm gun was placed on an anti-aircraft mount. On 21 May 1917, the suffix of all Austro-Hungarian torpedo boats was removed, and thereafter they were referred to only by the numeral. In June and July, Austro-Hungarian aircraft were constantly in action bombing various targets along the east coast of Italy. On a twenty-one seaplane raid targeting the harbour at Grado between Venice and Triest, and the main railway hub in the same area at Cervignano, 76 was part of the covering force which also included Scharfschutze and her sisters and , and the 250t-class boats 80 T, 92 F and 96 F. Turul was targeted by an enemy submarine, but evaded the torpedo. On 13 October, 76 was transferred to the Bocche, and three days later she and Csikos escorted the German minelaying submarine SM UC-54 through the defensive minefield outside the harbour on her way to a minelaying mission off the coast of the French protectorate of Tunisia. On 21 October, 76 and the Kaiman-class boat 60 escorted the German submarine SM UB-40 on a mission to interdict shipping off the North African coast. On 2 November, 76 was transferred back to Pola.