For the 1913–1914 shipbuilding programme for the Royal Navy, the British Admiralty, prompted by the First Lord of the Admiralty, Winston Churchill, had a need for faster destroyers than those built in previous years, in order to match reported German ships.[1] Consequentially, they issued a set of requirements that were similar to those that had led to the previous year's L class, such as mounting four torpedo tubes, except for a higher speed of 36 knots (41 mph; 67 km/h). The Admiralty first ordered two builder's specials each from the experienced destroyer builders Yarrow, Thonycroft and Hawthorn Leslie, to the builder's own designs in March 1913, with another ship ordered to Yarrow's design in May, and then ordered six to the standard Admiralty design, all with names beginning with M.[2][3]
Hawthorn Leslie's design was 271 feet 6 inches (82.75 m) long overall and 265 feet (81 m) between perpendiculars, with a beam of 27 feet (8.23 m) and a draught of 10 feet 8+1⁄2 inches (3.26 m). Displacement was 1,055 long tons (1,072 t) normal and 1,198 long tons (1,217 t) deep load.[4][5] Power was provided by four Yarrow water-tube boilers feeding steam to Parsonssteam turbines that drove two shafts. The machinery was rated at 27,000 shaft horsepower (20,000 kW), giving a speed of 34 knots (39 mph; 63 km/h).[6] Design range was 2,100 nautical miles (3,900 km; 2,400 mi) at 15 knots (28 km/h; 17 mph).[4] Peacetime fuel oil tankage was 290 long tons (290 t). In wartime, 145 long tons (147 t) of fuel oil was carried to give an endurance of 1,650 nautical miles (3,060 km; 1,900 mi) at 15 knots (28 km/h; 17 mph).[5] The uptakes from the boilers were routed to individual funnels, giving a total of four funnels.[7]
On 26 and 27 February 1916, the flotilla took part in a large naval exercise east of Shetland, involving four flotillas of destroyers, as well as all the operational battlecruisers, battleships and cruisers of the Grand Fleet. The exercise was deemed a success.[18] Between 24 and 26 March most of the Harwich Force, including Mansfield, formed an escort for the seaplane carrierVindex as Vindex transported aircraft to be used in a raid against the German Zeppelin base that was believed to be at Hoyer in Schleswig-Holstein.[19]Vindex launched five seaplanes on 25 March, but only two returned at the appointed time, reporting that the Zeppelin base was at Tondern rather than Hoyer, and that they had not been able to attack it.[20]Mansfield spotted two German patrol boats, Braunschweig and Otto Rudolf, and opened fire. Other destroyers then contributed to a barrage of shells that sank both boats.[21] During the return journey, the cruisers Cleopatra and Undaunted collided, badly damaging Undaunted, shortly after Cleopatra rammed and sank the German destroyer G194. Mansfield was unharmed.[22]
After the Armistice that ended the war, the Royal Navy returned to a peacetime level of strength and both the number of ships and personnel needed to be reduced to save money.[29] The destroyer was transferred to reserve at the Nore.[30] However, the harsh conditions of wartime operations, particularly the combination of high speed and the poor weather that is typical of the North Sea, exacerbated by the fact that the hull was not galvanised, meant that the ship was soon worn out.[31]Mansfield was declared superfluous to operational requirements, retired, and, on 26 October 1921, was sold to Barking Ship Breaking Co, and broken up.[32]
Bush, Steve; Warlow, Ben (2021). Pendant Numbers of the Royal Navy: A Complete History of the Allocation of Pendant Numbers to Royal Navy Warships & Auxiliaries. Barnsley: Seaforth Publishing. ISBN978-1-526793-78-2.
Colledge, James Joseph; Warlow, Ben (2006). Ships of the Royal Navy: The Complete Record of All Fighting Ships of the Royal Navy. London: Chatham Press. ISBN978-1-93514-907-1.
March, Edgar J. (1966). British Destroyers: A History of Development, 1892–1953; Drawn by Admiralty Permission From Official Records & Returns, Ships' Covers & Building Plans. London: Seeley Service. OCLC164893555.
McBride, Keith (1991). "British 'M' Class Destroyers of 1913–14". In Gardiner, Robert (ed.). Warship 1991. London: Conway Maritime Press. pp. 34–49. ISBN978-0-85177-582-1.