[1] Ardent was ordered to evaluate William Denny & Brothers' recently developed longitudinal framing method of building which offered greater hull strength for a given weight than conventional transverse construction.

[3] The ships displaced 1,072 long tons (1,089 t) at deep load and their crew numbered 73 officers and ratings.

[4] The primary armament of the ships consisted of three BL 4-inch (102 mm) Mk VIII guns[Note 1] in single, unprotected pivot mounts.

[5] HMS Ardent, the seventh Royal Navy ship to bear the name,[6] was ordered under the 1911–1912 Naval Programme from William Denny & Brothers.

[8] She was sunk on 1 June 1916 during the Battle of Jutland by secondary fire from the German dreadnought SMS Westfalen.