HMS Thunderer was the fourth and last dreadnought battleship built for the Royal Navy in the early 1910s. She spent the bulk of her career assigned to the Home and Grand Fleets. Aside from participating in the Battle of Jutland in May 1916 and the inconclusive action of 19 August, her service during World War I generally consisted of routine patrols and training in the North Sea.

After the Grand Fleet was dissolved in early 1919, Thunderer was transferred back to the Home Fleet for a few months before she was assigned to the Reserve Fleet. The ship was converted into a training ship for naval cadets in 1921 and served in that role until she was sold for scrap in late 1926. While being towed to the scrapyard, Thunderer ran aground; the ship was refloated and subsequently broken up.

Design and description The Orion-class ships were designed in response to the beginnings of the Anglo-German naval arms race and were much larger than their predecessors of the to accommodate larger, more powerful guns and heavier armour. In recognition of these improvements, the class was sometimes called "super-dreadnoughts". The ships had an overall length of , a beam of and a deep draught of . They displaced at normal load and at deep load as built; by 1918 Thunderers deep displacement had increased to . Her crew numbered 738 officers and ratings when completed in 1912 and 1,107 in 1917.Burt, p. 136

The Orion class was powered by two sets of Parsons direct-drive steam turbines, each driving two shafts, using steam provided by 18 Babcock & Wilcox boilers. The turbines were rated at and were intended to give the battleships a speed of .Parkes, p. 525 During her sea trials on 5 March 1912, Thunderer reached a maximum speed of from , although hampered by a boiler malfunction. The ships carried enough coal and fuel oil to give them a range of at a cruising speed of .Burt, pp. 136, 139–40

Armament and armour

The Orion class was equipped with 10 breech-loading (BL) Mark V guns in five hydraulically powered twin-gun turrets, all on the centreline. The turrets were designated 'A', 'B', 'Q', 'X' and 'Y', from front to rear. Their secondary armament consisted of 16 BL Mark VII guns. These guns were split evenly between the forward and aft superstructure, all in single mounts. Four 3-pounder () saluting guns were also carried. The ships were equipped with three 21-inch (533 mm) submerged torpedo tubes, one on each broadside and another in the stern, for which 20 torpedoes were provided.

The Orions were protected by a waterline armoured belt that extended between the end barbettes. Their decks ranged in thickness between and 4 inches with the thickest portions protecting the steering gear in the stern. The main battery turret faces were thick, and the turrets were supported by barbettes.Burt, pp. 134, 136, 139

Modifications

A prototype fire-control director was installed sometime before November 1912, on a platform below the spotting top.Brooks, p. 164 In 1914 the shelter-deck guns were enclosed in casemates and by October 1914, a pair of anti-aircraft (AA) guns were installed aboard each ship. Additional deck armour was added after the Battle of Jutland in May 1916. Around the same time, a pair of four-inch guns were removed from the aft superstructure. Two flying-off platforms were fitted aboard the ship during 1917–1918; these were mounted on 'B' and 'X' turret roofs and extended onto the gun barrels. A high-angle rangefinder was fitted in the forward superstructure by 1921.Burt, pp. 140, 142; Friedman, pp. 123, 198–200, 205

Construction and career Thunderer was the sixth ship of her name to serve in the Royal NavyColledge, p. 76 and was laid down by the Thames Ironworks and Shipbuilding Company at their shipyard in Poplar, London on 13 April 1910 and launched on 1 February 1911.Preston, p. 28 She was commissioned on 15 June 1912 at Devonport.Burt, p. 148 Including her armament, her cost is variously quoted at £1,892,823 or £1,885,145. Thunderer and her sister ships comprised the Second Division of the 2nd Battle Squadron (BS) of the Home Fleet.Parkes, p. 528 The ship, together with her sisters and , participated in the Parliamentary Naval Review on 9 July at Spithead. They then participated in training manoeuvres with Vice-Admiral Prince Louis of Battenberg commanding the "Blue Fleet" aboard Thunderer. On 13 November, the ship participated in comparative gunnery trials with Orion to evaluate the effectiveness of the former's gunnery director. Thunderer decisively outshot the latter ship, although some of her success was because her director was above the smoke that obscured the target from Orions guns. The test was repeated in better conditions on 4 December and Orion performed much better, apparently beating Thunderer.Brooks, pp. 164–65 The three sisters were present with the 2nd BS to receive the President of France, Raymond Poincaré, at Spithead on 24 June 1913. During the annual manoeuvres in August, Thunderer was the flagship of Vice-Admiral Sir John Jellicoe, commander of the "Red Fleet". On 4 November, Thunderer, Orion, the dreadnought and the predreadnought fired at and sank the target ship to give their crews experience in firing live ammunition against a real ship.Brown, p. 29

World War I

Between 17 and 20 July 1914, Thunderer took part in a test mobilisation and fleet review as part of the British response to the July Crisis. Arriving in Portland on 25 July, she was ordered to proceed with the rest of the Home Fleet to Scapa Flow four days laterBurt, p. 150 to safeguard the fleet from a possible surprise attack by the Imperial German Navy.Massie, p. 19 In August 1914, following the outbreak of World War I, the Home Fleet was reorganised as the Grand Fleet, and placed under the command of Admiral Jellicoe.Preston, p. 32 Repeated reports of submarines in Scapa Flow led Jellicoe to conclude that the defences there were inadequate and he ordered that the Grand Fleet be dispersed to other bases until the defences be reinforced. On 16 October the 2nd BS was sent to Loch na Keal on the western coast of Scotland. The squadron departed for gunnery practice off the northern coast of Ireland on the morning of 27 October and the dreadnought struck a mine, laid a few days earlier by the German armed merchant cruiser . Thinking that the ship had been torpedoed by a submarine, the other dreadnoughts were ordered away from the area, while smaller ships rendered assistance. On the evening of 22 November 1914, the Grand Fleet conducted a fruitless sweep in the southern half of the North Sea; Thunderer stood with the main body in support of Vice-Admiral David Beatty's 1st Battlecruiser Squadron. The fleet was back in port in Scapa Flow by 27 November.Goldrick, p. 156; Jellicoe, pp. 143–144, 148, 163–165 On 8 December, she sailed to Devonport for a brief refit to fix problems with her condensers.

1915–1916 Jellicoe's ships, including Thunderer, conducted gunnery drills on 10–13 January 1915 west of Orkney and Shetland. On the evening of 23 January, the bulk of the Grand Fleet sailed in support of Beatty's battlecruisers, but Thunderer and the rest of the fleet did not participate in the ensuing Battle of Dogger Bank the following day. On 7–10 March, the Grand Fleet conducted a sweep in the northern North Sea, during which it conducted training manoeuvres. Another such cruise took place on 16–19 March. On 11 April, the Grand Fleet conducted a patrol in the central North Sea and returned to port on 14 April; another patrol in the area took place on 17–19 April, followed by gunnery drills off Shetland on 20–21 April.Jellicoe, pp. 190–191, 194–196, 206, 211–212

The Grand Fleet conducted sweeps into the central North Sea on 17–19 May and 29–31 May without encountering any German vessels. During 11–14 June, the fleet conducted gunnery practice and battle exercises west of ShetlandJellicoe, pp. 217–219, 221–222 and more training off Shetland beginning on 11 July. The 2nd BS conducted gunnery practice in the Moray Firth on 2 August and then returned to Scapa Flow. On 2–5 September, the fleet went on another cruise in the northern end of the North Sea and conducted gunnery drills. Throughout the rest of the month, the Grand Fleet conducted numerous training exercises. The ship, together with the majority of the Grand Fleet, conducted another sweep into the North Sea from 13 to 15 October. Almost three weeks later, Thunderer participated in another fleet training operation west of Orkney during 2–5 November and repeated the exercise at the beginning of December.Jellicoe, pp. 228, 234–235, 243, 246, 250, 253, 257–258

The Grand Fleet sortied in response to an attack by German ships on British light forces near Dogger Bank on 10 February 1916, but it was recalled two days later when it became clear that no German ships larger than a destroyer were involved. The fleet departed for a cruise in the North Sea on 26 February; Jellicoe had intended to use the Harwich Force to sweep the Heligoland Bight, but bad weather prevented operations in the southern North Sea. As a result, the operation was confined to the northern end of the sea. Another sweep began on 6 March, but had to be abandoned the following day as the weather grew too severe for the escorting destroyers. On the night of 25 March, Thunderer and the rest of the fleet sailed from Scapa Flow to support Beatty's battlecruisers and other light forces raiding the German Zeppelin base at Tondern. By the time the Grand Fleet approached the area on 26 March, the British and German forces had already disengaged and a strong gale threatened the light craft, so the fleet was ordered to return to base. On 21 April, the Grand Fleet conducted a demonstration off Horns Reef to distract the Germans while the Imperial Russian Navy relaid its defensive minefields in the Baltic Sea.Jellicoe, pp. 270–71, 275, 279–80, 284, 286 The fleet returned to Scapa Flow on 24 April and refuelled before proceeding south in response to intelligence reports that the Germans were about to launch a raid on Lowestoft, but only arrived in the area after the Germans had withdrawn. On 2–4 May, the fleet conducted another demonstration off Horns Reef to keep German attention focused on the North Sea.Jellicoe, pp. 286–90

Battle of Jutland

In an attempt to lure out and destroy a portion of the Grand Fleet, the High Seas Fleet, composed of sixteen dreadnoughts, six predreadnoughts and supporting ships, departed the Jade Bight early on the morning of 31 May. The fleet sailed in concert with Hipper's five battlecruisers. Room 40 had intercepted and decrypted German radio traffic containing plans of the operation. In response the Admiralty ordered the Grand Fleet, totalling some 28 dreadnoughts and 9 battlecruisers, to sortie the night before to cut off and destroy the High Seas Fleet.Tarrant, pp. 54–55, 57–58