[1] The design was generally similar to the preceding M class, but differed in having geared steam turbines, giving greater fuel efficiency, the aft gun mounted on a raised platform, higher forecastle for better seakeeping and a larger and more robust bridge structure.

A total of 296 long tons (301 t) of fuel oil was carried, which gave a design range of 3,450 nautical miles (6,390 km; 3,970 mi) at 15 knots (28 km/h; 17 mph).

[2] Armament consisted of three single 4 in (102 mm) Mk IV guns on the ship's centreline, with one on the forecastle, one aft on a raised platform and one between the second and third funnels.

[5] Laid down by Harland & Wolff at their shipyard in Govan on 25 July 1916, Tenacious was launched on 21 March the following year and completed on 12 August.

[8] On commissioning, Tenacious was deployed as part of the Grand Fleet, joining the Eleventh Destroyer Flotilla.

[11] After the Armistice of 11 November 1918 that ended the war, the Grand Fleet was dissolved and Tenacious was moved to local defence based at Devonport.