The late 1930s saw a rapid development and modernization of the Royal
Navy. His Majesty's government decided to build new classes of
battleships, aircraft carriers, light cruisers which were distinctly
better suited for fighting surface combatants than escorting merchants
or hunting down and sinking submarines. The destroyers were no exception
and by the outbreak of the war in 1939, the British navy had
commissioned subsequent medium and large-size destroyers of: A, B, C, D,
E, F, G, H, I, J and K classes, as well as those of the Tribal class.
Sloops of the Grimsby, Bittern, Egret and Black Swan classes had also
been built. The British needed a large number of universal destroyers of
a smaller displacement, but versatile enough to perform various wartime
duties. A new type of destroyer, according to its design's creators
would perform the "fleet work" duties, which included escorting task
forces of larger ships and offensive gunnery and torpedo missions.
However, that concept soon became obsolete.