Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The first Torpedo Boat Destroyer (TBD) in the Royal Navy was HMS Havock of 1893. From 1906, the term "Torpedo Boat Destroyer" began to appear in the shortened form "Destroyer" when referring to Destroyer Flotillas. There is no official Admiralty order pertaining to the change and the abbreviated term "TBD" is present in the Navy List up to 1919, even though Destroyer was the term used in most official orders from 1917. Up to 1913, names were allocated under no fixed system, leading to a heterogeneous array, although 2 groups were named systematically; after rivers and tribes (later the E and F classes, respectively). In 1913, with burgeoning numbers of TBDs, the Admiralty took the confusing situation in hand; Havock and her similar "27 knotter" sisters with 2 shafts were grouped as the A class, and similar groups of "30 knotter" TBDs were grouped as the B class (4 funneled ships), C class (3 funnels) and D class (2 funnels). Later classes of ships were grouped as the E to K classes, although there was no J class.

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