Launched in November 1918 just before the Armistice that ended the First World War, Trusty joined the Home Fleet the following year.

Three White-Forster boilers fed steam to two sets of Brown-Curtis geared steam turbines rated at 27,000 shaft horsepower (20,000 kW) and driving two shafts, giving a design speed of 36 knots (67 km/h; 41 mph) at normal loading and 32.5 knots (60.2 km/h; 37.4 mph) at deep load.

The ship carried 301 long tons (306 t) of fuel oil, which gave a design range of 2,750 nautical miles (5,090 km; 3,160 mi) at 15 knots (28 km/h; 17 mph).

[4] The ship was designed to mount two additional 18-inch (457 mm) torpedo tubes either side of the superstructure but this required the forecastle plating to be cut away, making the vessel very wet, so they were soon removed.

[6] Trusty was laid down by J. Samuel White at East Cowes on the Isle of Wight with the yard number 1514 on 11 April 1918, and launched on 6 November the same year, just five days before the Armistice which ended the First World War.

[11] Like many of the class stored in reserve, the ship deteriorated and by the middle of the next decade was considered by the Admiralty to be in too poor condition to return to operations.