Minotaur-class cruiser (1906)

The Minotaur class was a three-ship class of armoured cruisers built in the first decade of the twentieth century for the Royal Navy. They initially served with the Home Fleet, generally as the flagships of cruiser squadrons. Minotaur became flagship of the China Station in 1910 and Defence served as flagship of the 1st Cruiser Squadron in the Mediterranean from 1912; Shannon remained at home as flagship of several different squadrons.

When World War I began in August 1914, Defence participated in the pursuit of the German ships SMS Goeben and SMS Breslau and Minotaur hunted for the German East Asia Squadron and German commerce raiders in the Pacific and Indian Oceans. Shannon remained with the Grand Fleet, as the Home Fleet was renamed, for the entire war. All three were present at the Battle of Jutland in May 1916, where Defence was sunk with heavy loss of life. The surviving pair spent most of the rest of the war assigned to the Northern Patrol unsuccessfully searching for German warships and commerce raiders. They were scrapped after the war.

Design and description
The Minotaur-class ships were the last armoured cruisers built for the Royal Navy. They were significantly larger and more heavily armed than their predecessors, although their armour was reduced in an attempt to compensate for the additional weight of the armament. The design was criticized for this weakness as well as the wide dispersal of the 7.5 in turrets along the length of the ship. They have been described by naval historian R. A. Burt as "cruiser editions of the ".

The Minotaur class displaced 14600 LT as built and 16630 LT at deep load. Defence and Minotaur had an overall length of 519 ft, a beam of 74 ft and a mean draught of 26 ft. Shannon had 1 ft more beam and one foot less draught than her sister ships to evaluate the theory that she might be faster with these proportions than her sisters. The class displaced 1050 lt more, was 13 ft longer overall, was one foot broader in beam and had more freeboard than their predecessors of the. At normal load they had a metacentric height of 3.05 ft, and at deep load, 3.25 ft. The Minotaurs were designed to carry 779 officers and enlisted men, but mustered 802–842 between 1908 and 1912.

The ships were powered by a pair of four-cylinder triple-expansion steam engines, each driving one shaft, which developed a total of 27000 ihp intended to give a maximum speed of 23 kn. The engines were powered by 24 water-tube boilers with a working pressure of 275 psi. They carried a maximum of 2060 LT of coal and an additional 750 LT of fuel oil that was sprayed on the coal to increase its burn rate. At full capacity, the ships could steam for 8150 nmi at a speed of 10 kn. During her sea trials on 6 December 1907, Minotaur made her designed speed when she reached 23.01 knots from 27049 ihp during her eight-hour full-power test. Shannon proved to be the slowest of the three and only reached 22.324 kn from 27372 ihp during her trial three days before Minotaur's.

Armament
The Minotaurs carried only four 50-calibre BL 9.2-inch Mk XI guns, compared to the six of the earlier ships, but the guns were mounted in twin hydraulically powered centreline turrets, which gave them the same four-gun broadside as the Duke of Edinburghs. The guns had an elevation range of −5°/+15°. They fired 380 lb projectiles at a muzzle velocity of 2875 ft/s; this provided a maximum range of 16200 yd with armour-piercing (AP) shells. The rate of fire of these guns was up to four rounds per minute and the ships carried 100 rounds per gun.

The secondary armament was much heavier than the older ships, with five single hydraulically powered turrets equipped with 50-calibre BL 7.5-inch Mk II guns mounted on each side. The guns could be depressed to −7.5° and elevated to +15°. Using 4crh AP shells, they had a maximum range of 15571 yd. Their 200 lb projectiles were fired at a muzzle velocity of 2841 ft/s at four rounds per minute. Each gun was provided with 100 rounds.

Anti-torpedo boat defence was provided by sixteen QF 12-pounder 18-cwt guns. Most of these were mounted on the tops of the turrets and the remaining four in the superstructure fore and aft. They fired 3 in, 12.5 lb projectiles at a muzzle velocity of 2660 ft/s; this gave a maximum range of 9300 yd at their maximum elevation of +20°. They also mounted five submerged 18-inch torpedo tubes, two on each broadside, plus one mounted in the stern.

Armour
Armour in the Minotaur class was reduced compared to the earlier ships. The upper belt, considered superfluous after the elimination of the main deck casemates, was eliminated as were the transverse bulkheads that connected the waterline belt to the barbettes that protected the ships from raking fire. The 6 in waterline armour belt of Krupp cemented armour extended past the fore and aft 7.5-inch gun turrets; its lower edge was about 5 ft below the waterline at normal load. Forward the armour was 4 in up to about 50 ft from the bow when it was reduced to three inches; aft the belt armour was three inches thick all the way to the stern. In addition to this, the engine cylinders were protected by armour plates 1.5 - 2 in thick.

The faces of the primary gun turrets were 8 in thick and they had 7 in sides. The face armour for the 7.5-inch turrets was also eight inches thick, but their sides were only 6 in thick. The main barbettes were protected by seven inches of armour as were the ammunition hoists, although the armour for those thinned to two inches between the lower and main decks. The thickness of the lower deck ranged from 1.5 inches on the flat amidships to two inches on the slope connecting it to the lower edge of the waterline belt for the length of the ship. At the ends of the ship, the thickness of the deck armour increased to two inches. The sides of the forward conning tower were 10 inches thick while those of the rear conning tower were three inches in thickness.

Modifications
The funnels were raised 15 ft in 1909 to eliminate smoke interference with the bridge. During 1915–16, a 12-pounder was fitted to the rear superstructure and a three-pounder to the quarterdeck, both guns on high-angle mounts for anti-aircraft defence. In 1916, reinforcing legs were added to the foremast to support the weight of a fire-control director; Shannon received her director that same year and Minotaur in 1917–18. In the last year of the war, the reinforced foremast was replaced by a stronger tripod mast and the 12-pounder was moved to the top of the forward turret.

Careers
The sisters were all initially assigned to the Home Fleet upon commissioning with Shannon frequently serving as the flagship of the 5th, 2nd and 3rd Cruiser Squadrons before reverting to the flagship of the 2nd Squadron in 1914. Minotaur became the flagship of the China Station in 1910 and she was briefly joined by Defence in 1912 before the latter was transferred to the Mediterranean at the end of the year to serve as flagship of the 1st Cruiser Squadron there.

When the war began, Minotaur searched unsuccessfully for the German East Asia Squadron in the Pacific and the commerce-raiding light cruiser SMS Emden (1908) in the Indian Ocean before she was transferred to the Grand Fleet at the end of 1914. She became flagship of the 7th Cruiser Squadron and was assigned to the Northern Patrol. Defence participated in the pursuit of the German battlecruiser SMS Goeben and light cruiser SMS Breslau, but Rear-Admiral Ernest Troubridge decided not to engage Goeben due to the latter's more powerful guns, heavier armour and faster speed. She then blockaded the German ships inside the Dardanelles. The Admiralty ordered the ship to the South Atlantic in October to join Rear-Admiral Christopher Cradock's squadron searching for the German ships. Defence, however, had only reached Montevideo, Uruguay by 3 November when she received word that most of Admiral Cradock's squadron had been destroyed two days previously at the Battle of Coronel. The ship was then ordered to South Africa to escort a troop convoy to Great Britain. Defence departed Table Bay, Cape Town in December and rejoined the 1st Cruiser Squadron of the Grand Fleet as its flagship upon her arrival.

In early 1915, the sisters were all assigned to the Grand Fleet, each as flagship of their respective squadrons. Just before the Battle of Jutland on 31 May 1916, the 2nd and 7th Cruiser Squadrons were combined with Minotaur as the flagship. During the battle the 2nd Cruiser Squadron was unengaged and did not fire their guns. In contrast the 1st Cruiser Squadron was engaged at close range by the German capital ships during the battle; Defence was hit by two salvoes from the German ships that caused the aft 9.2-inch magazine to explode. The resulting fire spread via the ammunition passages to the adjacent 7.5-inch magazines which detonated in turn. The ship exploded with the loss of all men on board; between 893 and 903 men were killed.

Shannon and Minotaur were also present during the attempted interception of the High Seas Fleet by the Grand Fleet on 19 August although no combat occurred. For the rest of the war, the ships were assigned to the Northern Patrol. On 11 December 1917, the sisters and four destroyers were assigned to patrol the convoy route between Lerwick and Norway, but the Germans successfully destroyed a convoy off the Norwegian coast on the following day and returned home without being spotted. The British ships were only able to rescue survivors and escort the sole surviving ship from the convoy, the crippled destroyer HMS Pellew (1916), back to Scapa Flow.

The sisters were paid off in 1919, although Shannon temporarily became a training ship before the two were sold for scrap in 1920. Shannon was not actually broken up until January 1923.