Italian battleship Conte di Cavour
Conte di Cavour at speed in her original configuration
|Career (Kingdom of Italy)|
|Name:||Conte di Cavour|
|Namesake:||Count Camillo Benso di Cavour|
|Builder:||La Spezia Arsenale, La Spezia|
|Laid down:||10 August 1910|
|Launched:||10 August 1911|
|Completed:||1 April 1915|
|Refit:||October 1933–June 1937|
|Captured:||10 September 1943|
|General characteristics (as built)|
|Type:||Conte di Cavour-class dreadnought battleship|
|Displacement:||23,088 long tons (23,458 t) (standard)
25,086 long tons (25,489 t) (deep load)
|Length:||176 m (577 ft 5 in) (o/a)|
|Beam:||28 m (91 ft 10 in)|
|Draught:||9.3 m (30 ft 6 in)|
|Installed power:||31,000 shp (23,000 kW)
20 × Water-tube boilers
|Propulsion:||4 × Shafts
4 × Steam turbines
|Speed:||21.5 knots (39.8 km/h; 24.7 mph)|
|Range:||4,800 nmi (8,900 km; 5,500 mi) at 10 knots (19 km/h; 12 mph)|
|Complement:||31 officers and 969 enlisted men|
|General characteristics (after reconstruction)|
|Displacement:||29,100 long tons (29,600 t) (deep load)|
|Length:||186.4 m (611 ft 7 in)|
|Beam:||33.1 m (108 ft 7 in)|
|Installed power:||75,000 shp (56,000 kW)
8 × Yarrow boilers
|Propulsion:||2 × Shafts
2 × Geared steam turbines
|Speed:||27 knots (50 km/h; 31 mph)|
|Range:||6,400 nmi (11,900 km; 7,400 mi) at 13 knots (24 km/h; 15 mph)|
|Armor:||Deck: 166–135 mm (6.5–5.3 in)
Barbettes: 280–130 mm (11.0–5.1 in)
Conte di Cavour was the name ship of the three Conte di Cavour-class battleships built for the Royal Italian Navy (Regia Marina) in the 1910s. She served during both World War I and World War II, although she was little used and saw no combat during the former. The ship supported operations during the Corfu Incident in 1923 and spent much of the rest of the decade in reserve. She was rebuilt between 1933 and 1937 with more powerful guns, additional armor and considerably more speed than before.
Both Conte di Cavour and her sister ship, Giulio Cesare, participated in the Battle of Calabria in July 1940, where the latter was lightly damaged. They were both present when British torpedo bombers attacked the fleet at Taranto in November 1940, and Conte di Cavour was torpedoed. She was deliberately grounded, with most of her hull underwater, and her repairs were not completed before the Italian surrender in September 1943. The ship was turned over to the Germans at that time, but they made no use of her. She was damaged in an Allied air raid in early 1945, and capsized seven days later. Conte di Cavour was eventually scrapped in 1946.
Conte di Cavour was 168.9 meters (554 ft 2 in) long at the waterline, and 176 meters (577 ft 5 in) long overall. The ship had a beam of 28 meters (91 ft 10 in), and a draft of 9.3 meters (30 ft 6 in). She displaced 23,088 long tons (23,458 t) at normal load, and 25,086 long tons (25,489 t) at deep load. She had a crew of 31 officers and 969 enlisted men. The ship's machinery consisted of four Parsons steam turbines, each driving one propeller shaft. Steam for the turbines was provided by 20 Blechynden water-tube boilers, eight of which burned fuel oil, and twelve which burned both oil and coal. Designed to reach a maximum speed of 22.5 knots (41.7 km/h; 25.9 mph) from 31,000 shaft horsepower (23,000 kW), Conte di Cavour failed to reach this goal on her sea trials, despite generally exceeding the rated power of her turbines. The ship only made a maximum speed of 22.2 knots (41.1 km/h; 25.5 mph) using 31,278 shp (23,324 kW). She had a cruising radius of 4,800 nautical miles (8,900 km; 5,500 mi) at 10 knots (19 km/h; 12 mph).
The ship was armed with a main battery of thirteen 305 mm (12.0 in) guns in three triple-gun turret and two twin-gun turrets, designated 'A', 'B', 'Q', 'X', and 'Y' from front to rear. The secondary battery comprised eighteen 120 mm (4.7 in) guns, all mounted in casemates in the sides of the hull. Conte di Cavour was also armed with fourteen 76 mm (3.0 in) guns. As was customary for capital ships of the period, she was equipped with three submerged 450 mm (18 in) torpedo tubes. She was protected with Krupp cemented steel manufactured by Terni. The belt armor was 250 mm (9.8 in) thick and the main deck was 40 mm (1.6 in) thick. The conning tower and main battery turrets were protected with 280 mm (11 in) worth of armor plating.
Modifications and reconstruction
Shortly after the end of World War I, the number of 50-caliber 76 mm guns was reduced to 13, all mounted on the turret tops, and six new 40-caliber 76-millimeter anti-aircraft (AA) guns were installed abreast the aft funnel. In addition two license-built 2-pounder AA guns were mounted on the forecastle deck. In 1925–26 the foremast was replaced by a four-legged mast, which was moved forward of the funnels, the rangefinders were upgraded, and the ship was equipped to handle a Macchi M.18 seaplane mounted on the center turret. Around that same time she was equipped with a fixed aircraft catapult on the port side of the forecastle.
Conte di Cavour began an extensive reconstruction in October 1933 at the CRDA Trieste shipyard that lasted until June 1937. A new bow section was grafted over the existing bow, which increased her length by 10.31 meters (33 ft 10 in) to 186.4 meters (611 ft 7 in) and her beam increased to 28.6 meters (93 ft 10 in). The ship's draft at deep load increased to 10.02 meters (32 ft 10 in). All of the changes made increased her displacement to 26,140 long tons (26,560 t) at standard load and 29,100 long tons (29,600 t) at deep load. The ship's crew increased to 1,260 officers and enlisted men. Two of the propeller shafts were removed and the existing turbines were replaced by two Belluzzo geared steam turbines rated at 75,000 shp (56,000 kW). The boilers were replaced by eight Yarrow boilers. In service her maximum speed was about 27 knots (50 km/h; 31 mph) and she had a range of 6,400 nautical miles (11,900 km; 7,400 mi) at a speed of 13 knots (24 km/h; 15 mph).
The main guns were bored out to 320 millimeters (12.6 in) and the center turret and the torpedo tubes were removed. All of the existing secondary armament and AA guns were replaced by a dozen 120 mm guns in six twin-gun turrets and eight 102-millimeter (4.0 in) AA guns in twin turrets. In addition the ship was fitted with a dozen Breda 37-millimeter (1.5 in) light AA guns in six twin-gun mounts and twelve 13.2-millimeter (0.52 in) Breda M31 anti-aircraft machine guns, also in twin mounts. In 1940 the 13.2 mm machine guns were replaced by 20-millimeter (0.8 in) AA guns in twin mounts. The tetrapodal mast was replaced with a new forward conning tower, protected with 260-millimeter (10.2 in) thick armor. Atop the conning tower there was a fire-control director fitted with two large stereo-rangefinders, with a base length of 7.2 meters (23.6 ft).
The deck armor was increased during the reconstruction to a total of 135 millimeters (5.3 in) over the engine and boiler rooms and 166 millimeters (6.5 in) over the magazines, although its distribution over three decks, each with multiple layers, meant that it was considerably less effective than a single plate of the same thickness. The armor protecting the barbettes was reinforced with 50-millimeter (2.0 in) plates. All this armor weighed a total of 3,227 long tons (3,279 t). The existing underwater protection was replaced by the Pugliese torpedo defense system; a large cylinder surrounded by fuel oil or water that was intended to absorb the blast of a torpedo warhead. It lacked enough depth to be fully effective against contemporary torpedoes. A major problem of the reconstruction was that the ship's increased draft meant that their waterline armor belt was almost completely submerged with any significant load.
Construction and service
Conte di Cavour, named after the statesman Count Camillo Benso di Cavour, was laid down at La Spezia Arsenale, La Spezia, on 10 August 1910, and launched on 10 August 1911. She was completed on 1 April 1915, and served as a flagship in the southern Adriatic Sea during World War I. She saw no action, however, and spent little time at sea. Admiral Paolo Thaon di Revel, the Italian naval chief of staff, believed that Austro-Hungarian submarines and minelayers could operate too effectively in the narrow waters of the Adriatic. The threat from these underwater weapons to his capital ships was too serious for him to use the fleet in an active way. Instead, Revel decided to implement a blockade at the relatively safer southern end of the Adriatic with the battle fleet, while smaller vessels, such as MAS torpedo boats, conducted raids on Austro-Hungarian ships and installations. Meanwhile, Revel's battleships would be preserved to confront the Austro-Hungarian battle fleet in the event that it sought a decisive engagement.
In 1919 she sailed to North America and visited ports in the United States as well as Halifax, Canada. The ship was mostly inactive in 1921 because of personnel shortages, and was refitted at La Spezia from November to March 1922. Conte di Cavour and Giulio Cesare supported Italian operations on Corfu in 1923 after an Italian general and his staff were murdered on Corfu; Benito Mussolini was not satisfied with the Greek Government's response, so he ordered Italian troops to occupy the island. Conte di Cavour bombarded the town with her 76 mm guns, killing 20 and wounding 32 civilians. She escorted King Victor Emmanuel III and his wife aboard the battleship Dante Alighieri on a state visit to Spain in 1924, and was placed in reserve upon her return until 1926, when she conveyed Mussolini on a voyage to Libya. The ship was again placed in reserve from 1927 until 1933, when she began her reconstruction.
World War II
Early in World War II, the Conte di Cavour and her sister took part in the Battle of Calabria (also known as the Battle of Punto Stilo) on 9 July 1940. They were part of the 1st Battle Squadron, commanded by Admiral Inigo Campioni, during which they engaged major elements of the British Mediterranean Fleet. The British were escorting a convoy from Malta to Alexandria, while the Italians had finished escorting another from Naples to Benghazi, Libya. Admiral Andrew Cunningham, commander of the Mediterranean Fleet, attempted to interpose his ships between the Italians and their base at Taranto. Crew on the fleets spotted each other in the middle of the afternoon and the Italian battleships opened fire at 15:53 at a range of nearly 27,000 meters (29,000 yd). The two leading British battleships, HMS Warspite and Malaya, replied a minute later. Three minutes after she opened fire, shells from Giulio Cesare began to straddle Warspite which made a small turn and increased speed, to throw off the Italian ship's aim, at 16:00. At that same time, a shell from Warspite struck Giulio Cesare at a distance of about 24,000 meters (26,000 yd). Uncertain how severe the damage was, Campioni ordered his battleships to turn away in the face of superior British numbers and they successfully disengaged. Repairs to Giulio Cesare were completed by the end of August and both ships unsuccessfully attempted to intercept British convoys to Malta in August and September.
On the night of 11 November 1940, Conte di Cavour was at anchor in Taranto harbor when she was attacked by 21 Fairey Swordfish torpedo bombers from the British aircraft carrier HMS Illustrious, along with several other warships. The ship's gunners shot down one Swordfish shortly after the aircraft dropped its torpedo, but it exploded underneath 'B' turret at 23:15, knocking out the main bow pump. Her captain requested tugboats to help ground the ship on a nearby 12-meter (39 ft) sandbank at 23:27, but Admiral Bruno Brivonesi, commander of the 5th Battleship Division, vetoed the request until it was too late and Conte di Cavour had to use a deeper, 17-meter (56 ft), sandbank at 04:45 the following morning. She initially grounded on an even keel, but temporarily took on a 50-degree list before settling to the bottom at 08:00 with a 11.5-degree list. Only her superstructure and gun turrets were above water by this time.
Conte di Cavour had the lowest priority for salvage among the three battleships sunk during the attack and little work was done for several months. The first priority was to patch the holes in the hull and then her guns and parts of her superstructure were removed to lighten the ship. False bulwarks were welded to the upper sides of the hull to prevent water from reentering the hull and pumping the water overboard began in May 1941. Some 15,000 metric tons (15,000 long tons) of water were pumped out before Conte di Cavour was refloated on 9 June and entered the ex-Austro-Hungarian floating dry dock GO-12 on 12 July. The damage was more extensive than originally thought and temporary repairs to enable the ship to reach Trieste for permanent repairs took until 22 December.
Her guns were operable by September 1942, but replacing her entire electrical system took longer so the navy took of the advantage of the delays and incorporated some modifications based on lessons learned from the attack. Other changes planned were the replacement of her secondary and anti-aircraft weapons with a dozen 135-millimeter (5.3 in) dual-purpose guns in twin mounts, twelve 65-millimeter (2.6 in), and twenty-three 20 mm AA guns. The repair work was suspended in June 1943, with an estimated six months work left to do on Conte di Cavour remaining, in order to expedite the construction of urgently needed smaller ships. She was turned over to the Germans on 8 September when Italy surrendered to the Allies, and was reduced to a hulk. She was damaged in an air raid on 17 February 1945, and capsized on 23 February. Refloated shortly after the end of the war, Conte di Cavour was scrapped in 1946.
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