Italian Cruiser Trieste

''Trieste'' was the second of two heavy cruisers built for the Italian ''Regia Marina'' (Royal Navy). The ship was laid down in June 1925, was launched in October 1926, and was commissioned in December 1928. ''Trieste'' was very lightly armored, with only a thick armored belt, though she possessed a high speed and heavy main battery of eight guns. Though nominally built under the restrictions of the Washington Naval Treaty, the two cruisers significantly exceeded the displacement limits imposed by the treaty. The ship spent the 1930s conducting training cruises in the Mediterranean Sea, participating in naval reviews held for foreign dignitaries, and serving as the flagship of the Cruiser Division. She also helped transport Italian volunteer troops that had been sent to Spain to fight in the Spanish Civil War return to Italy in 1938.

The ship saw extensive action during World War II, including the battles of Cape Spartivento and Cape Matapan in November 1940 and March 1941, respectively. ''Trieste'' was also employed to escort convoys to supply Italian forces in North Africa; during one of these operations in November 1941, she was torpedoed by a British submarine. On 10 April 1943, while the ship was moored in La Maddalena, Sardinia, she was bombed and sunk by American heavy bombers. Her superstructure was cut away and she was refloated in 1950; the Spanish Navy purchased the hull in 1952, with plans to convert the vessel into a light aircraft carrier, though the plan came to nothing due to the growing costs of the project. She was ultimately broken up by 1959.

Design

''Trieste'' was long overall, with a beam of and a draft of . She displaced at full load, though her displacement was nominally within the restriction set in place by the Washington Naval Treaty. The ship's superstructure included a large conning tower forward and a smaller, secondary conning position aft. She was fitted with a pair of tripod masts, one just aft of the conning tower and the second further aft. She had a crew of 723 officers and enlisted men, though during the war this increased to 781.

Her power plant consisted of four Parsons steam turbines powered by twelve oil-fired Yarrow boilers, which were trunked into two funnels amidships. Her engines were rated at for a top speed of , but on sea trials only reached . That speed could only be reached on a very light displacement, and in service, her practical top speed was only . The ship had a cruising range of at a speed of .

''Trieste'' was armed with a main battery of eight Mod 24 50-caliber guns in four gun turrets. The turrets were arranged in superfiring pairs forward and aft. Anti-aircraft defense was provided by a battery of sixteen 47-cal. guns in twin mounts, four Vickers-Terni 40 mm/39 guns in single mounts and four guns. In addition to the gun armament, she carried eight torpedo tubes in four deck mounted twin launchers. She carried a pair of IMAM Ro.43 seaplanes for aerial reconnaissance; the hangar was located in under the forecastle and a fixed catapult was mounted on the centerline at the bow.

''Trieste''s secondary battery was revised several times during her career. The 100 mm guns were replaced with newer Mod 31 versions of the same caliber. In 1937–1938, the two aft-most 100 mm guns were removed, along with all four 12.7 mm machine guns; eight 54-cal. Breda M1932 guns and eight Breda M1931 machine guns, all in twin mounts, were installed in their place. In 1943, the ship received eight 65-cal. Breda M1940 guns in single mounts.

She was protected with an armor belt that was thick amidships with armored bulkheads thick on either end. Her armor deck was thick in the central portion of the ship and reduced to at either end. The gun turrets had thick plating on the faces and the supporting barbettes they sat in were thick. The main conning tower had 100 mm thick sides.

Service history

''Trieste'' had her keel laid at the Stabilimento Tecnico Triestino shipyard in her namesake city on 22 June 1925. The completed hull was launched on 24 October 1926, a year before her sister . After fitting-out work was completed, the ship was commissioned into the Italian fleet on 21 December 1928. On 16 May 1929 she joined ''Trento'' in the newly created Cruiser Division for a cruise in the northern Mediterranean Sea that lasted until 4 June. On 1 October, ''Trieste'' became the flagship of the 1st Squadron. In mid-1931, she entered the shipyard in La Spezia for an overhaul that included the replacement of her tripod foremast with a more stable five-legged version. On 6 and 7 July 1933, ''Trieste'', ''Trento'', and the four s held a naval review for the Italian dictator Benito Mussolini in the Gulf of Naples. On 2 December 1933, ''Trieste'', ''Trento'', and the heavy cruiser formed the 2nd Division of the 1st Squadron. The unit was renamed the 3rd Division in July 1934.

On 18 June 1935, ''Trieste'' temporarily relieved ''Trento'' as the divisional flagship. Mussolini took a short tour of Italian Libya from 10 to 12 March 1937, and ''Trieste'' was among the vessels to escort him. On 7 June, she took part in a major naval review held during the visit of German Field Marshal Werner von Blomberg. The ship became the 2nd Squadron flagship on 15 February 1938. On 5 May, another naval review was held in the Gulf of Naples, this time for the state visit of German dictator Adolf Hitler. On 12 October 1938, ''Trieste'' steamed out of Messina with the 10th Destroyer Squadron, bound for Cadiz, Spain. There, they met four Italian merchant ships on 15 October, which embarked 10,000 members of the ''Corpo Truppe Volontarie'' (Corps of Volunteer Troops) that had been sent to support General Francisco Franco's Nationalist forces during the Spanish Civil War. The convoy left Cadiz on 16 October and arrived back in Naples on the 20th. On 17 May 1939, ''Trieste'' took part in another fleet review, this one for Prince Paul of Yugoslavia during his visit to Italy. From 5 to 19 June, ''Trieste'' joined the rest of the fleet in Livorno for the first celebration of Navy Day on 10 June. From October to December, the ship underwent a major refit, which included modifications to her armament and the installation of funnel caps.

World War II

On 10 June 1940, Italy declared war on Britain and France, formally entering World War II. The heavy cruiser replaced ''Trieste'' as the squadron flagship, which in turn became the flagship of the 3rd Division, which also included ''Trento'' and ''Bolzano''. These four cruisers deployed north of Sicily to patrol for Allied vessels on Italy's first day of the war. On 31 August, the 3rd Division sortied to intercept the British convoy from Alexandria to Malta in Operation Hats, though the Italian fleet broke off the operation without encountering the merchant ships. ''Trieste'' arrived back in Taranto on 2 September. She was present there on the night of 11–12 November, when the British raided the port, and she emerged undamaged.

''Trieste'' sortied with the fleet on 26 November in an attempt to intercept another convoy to Malta. The following morning, a reconnaissance floatplane from ''Bolzano'' located the British squadron. Shortly after 12:00, Italian reconnaissance reports informed the Italian fleet commander, Vice Admiral Inigo Campioni of the strength of the British fleet, and so he ordered his ships to disengage. By this time, ''Trieste'' and the other heavy cruisers had already begun engaging their British counterparts in the Battle of Cape Spartivento, and had scored two hits on the cruiser , the second of which is credited to either ''Trieste'' or ''Trento''. The battlecruiser intervened, and quickly straddled ''Trieste'' twice, though the salvo inflicted only splinter damage. This compelled Campioni to commit the battleship , which in turn forced the British cruisers to break off the action, allowing both sides to disengage.

On 9 February 1941, ''Trieste'' sortied with the rest of the 2nd Squadron to search for Force H after the latter had shelled Genoa; the Italians returned to port without success. On 12–13 March, ''Trieste'' escorted a fast convoy to North Africa.

Battle of Cape Matapan

On 27 March, the division sortied with the rest of the fleet for a major sweep toward the island of Crete. During the operation, ''Trieste'' flew the flag of Rear Admiral Luigi Sansonetti. At 06:55 on the 28th, an IMAM Ro.43 floatplane launched by ''Vittorio Veneto'' located a British cruiser squadron, and by 07:55, ''Trieste'' and the 3rd Division had come within visual range. Seventeen minutes later, the Italian cruisers opened fire from a range of , initiating the first phase of the Battle of Cape Matapan; in the span of the next forty minutes, ''Trieste'' fired a total of 132  armor-piercing shells, though trouble with her rangefinders and the extreme range of the action prevented her from scoring any significant hits.

At 08:55, the Italian fleet commander, Vice Admiral Angelo Iachino instructed Sansonetti to break off the action with the British cruisers and turn northwest, to lure the British vessels into range for ''Vittorio Veneto''. By about 11:00, ''Vittorio Veneto'' had closed the distance enough to open fire, prompting Sansonetti to turn his three cruisers back to join the fight. The 6-inch-gun-armed British cruisers were outmatched both by the Italian heavy cruisers and ''Vittorio Veneto'', and they quickly reversed course. While the two sides were still maneuvering, a group of British torpedo bombers from Crete arrived and unsuccessfully attacked ''Trieste'' and the rest of her division shortly after 12:00. Further attacks from the aircraft carrier convinced Iachino to break off the action and withdraw at 12:20.

Later in the day, ''Vittorio Veneto'' and ''Pola'' were torpedoed by British aircraft, the latter left immobilized. ''Trieste'', ''Trento'', and ''Bolzano'' were also attacked by aircraft, but they escaped without damage. ''Trieste'' reached Taranto in company with the damaged ''Vittorio Veneto'' at 15:30 the following day. in the meantime, ''Pola'' and two other ''Zara''-class cruisers were destroyed in the night action with British battleships late on the 28th.

Convoy operations

From 24 to 30 April, ''Trieste'' and ''Bolzano'' escorted a convoy to North Africa. A combination of heavy seas and the presence of British warships forced the convoy to shelter in Palermo, Messina, and Augusta in Sicily before being able to make the crossing to Tripoli. A month later, the two cruisers covered another convoy; for the return leg of the voyage, the ships joined a second convoy also returning to Italy. Another convoy made the crossing on 8–9 June, again escorted by ''Trieste'' and ''Bolzano'', along with the destroyers , , and . ''Trieste'' and the heavy cruiser and the vessels of the 12th Destroyer Squadron covered four ocean liners that had been converted into troopships on 25 June; heavy British air attacks that night forced the convoy to return to Taranto. A second attempt was made on 27 June, and the ships successfully reached Tripoli on the morning of the 29th. Heavy air attacks targeted the ships while they were unloading the following day, but the ships were able to complete the task, depart that day, and reach Taranto on 1 July.

From 16 to 20 July, ''Trieste'', ''Bolzano'', ''Ascari'', ''Corazziere'', and the destroyer covered another fast convoy to Tripoli. On 22 August, ''Trieste'' sortied with other elements of the Italian fleet to try to locate Force H; they returned to port four days later empty handed. In late September, the British sent another convoy to reinforce Malta, codenamed Operation Halberd; the Italian fleet sortied on 26 September to try to intercept it, but broke off the operation upon discovering the strength of the British escort force. ''Trieste'' took part in the ''Duisburg'' convoy on 8–9 November along with ''Trento'', the two ships serving as the convoy's covering force. The convoy was attacked by British warships in the early hours of 9 November, though the covering force failed to intervene and the convoy was destroyed.{{sfn, Brescia, p=48

''Trieste'' escorted another convoy to Libya on 21 November in company with the light cruiser {{ship, Italian cruiser, Luigi di Savoia Duca degli Abruzzi, , 2. Late that evening, the convoy came under a combined submarine and aircraft attack; at 23:12, ''Trieste'' was torpedoed by the submarine {{HMS, Utmost, and a torpedo bomber hit ''Duca degli Abruzzi'' shortly thereafter. The two damaged vessels were escorted back to Messina by the cruiser {{ship, Italian cruiser, Giuseppe Garibaldi, 1936, 2 and the destroyer {{ship, Italian destroyer, Bersagliere, 1938, 2, arriving at around 08:00 the next morning. After repairs were completed, ''Trieste'' joined ''Bolzano'' and ''Gorizia''—the only other surviving heavy cruisers in the fleet—in the reorganized 3rd Division. The ships sortied with eight destroyers on 12 August 1942 to try to intercept a British convoy; while turning back after the operation was cancelled, ''Bolzano'' and one of the destroyers were torpedoed by a British submarine.{{sfn, Hogg & Wiper, p=11

Fate

On 10 April 1943, while moored in La Maddalena, Sardinia, ''Trieste'' came under attack from B-24 Liberator heavy bombers from the United States Army Air Forces. She received several hits at 13:45, and at 16:13 she capsized to starboard and sank in the shallow water.{{sfn, Hogg & Wiper, p=11 Casualties were relatively light, with 66 men killed or missing—of those, three were officers, eight were non-commissioned officers, and fifty-five were enlisted sailors—and 66 wounded—eight NCOs and fifty-eight sailors.{{sfn, Sanna, p=11 The ship remained on the naval register until 18 October 1946, when she was formally stricken. Salvage operations began in 1950, starting with the removal of the ship's superstructure. The hull was then made watertight, was refloated, still capsized, and was towed to La Spezia. There, the ship was righted, and upon inspection, the shipyard workers discovered that fuel oil that had leaked into the engine rooms had preserved the machinery. The Spanish Navy purchased the hull and towed it to Cartagena and then to Ferrol in 1952 to convert ''Trieste'' into a light aircraft carrier. The cost of the project proved to be prohibitive, and in 1956 the Spanish Navy sold the vessel for scrap; the ship was broken up by 1959.{{sfn, Hogg & Wiper, p=11

Notes

{{reflist, 20em

References

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Further reading

* {{cite book
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, last2=de Toro
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External links

{{commons category

Trieste
Marina Militare website

{{Portal bar, Italy, Engineering
{{Trento-class cruiser
{{April 1943 shipwrecks

{{DEFAULTSORT:Trieste
Trento-class cruisers
Cruisers sunk by aircraft
Ships sunk by US aircraft
Maritime incidents in April 1943
1926 ships
World War II cruisers of Italy