 The eighth 'special' was by William Denny, Dumbarton, which was built using longitudinal framing rather than conventional transverse framing.While "Ardent" novel construction seems to have been a success, no more destroyers were built for the Royal Navy using longitudinal framing until the J-class destroyers in the 1930s.At the outbreak of World War I until mid-1916, the "Acasta"s were serving in the Grand Fleet as the 4th Destroyer Flotilla, with as leader.