The Beagle class (officially redesignated as the G class in 1913) was a class of sixteen destroyers of the Royal Navy, all ordered under the 1908-1909 programme and launched in 1909 and 1910. The Beagles served during World War I, particularly during the Dardanelles Campaign of 1915. Design For the 1908–1909 shipbuilding programme, the British Admiralty decided to revert to a smaller, more affordable destroyer to follow-on from the large and fast (required to reach ) and the experimental . The destroyers needed sufficient range to operate across the North Sea in the event of a confrontation with Germany, which rendered the coastal destroyers which had been built as a low-cost supplement to the expensive Tribals outdated, requiring larger numbers of a cheaper standard destroyer. While the Tribals were oil fuelled, it was decided to return to the use of coal for the new destroyers, because of concerns over the availability of oil stocks in the event of a war and to reduce costs. They were the last British destroyers to be so fueled. The Beagles were not built to a standard design, with detailed design being left to the builders of individual ships in accordance with a loose specification. They were between and long between perpendiculars, with a beam of between and , with an average draught of . It was expected that the ships would displace but the builder's designs came out heavier, at about normal and full load. Five Yarrow or White-Forster boilers fed direct-drive steam turbines driving three propeller shafts. The machinery was rated at to give a speed of . Three funnels were fitted. The Beagle class was designed to carry a gun armament of five 12-pounder (76 mm) guns, with two mounted side by side on a raised platform on the ship's forecastle, two on the ship's beams, with the port gun mounted ahead of the starboard gun and one aft. While the ships were building, however, it was decided to replace the two forecastle guns by a single gun, giving a gun armament of one BL 4 inch naval gun Mk VIII and three QF 12-pounder 12 cwt guns) Torpedo armament consisted of two torpedo tubes, with one between the ship's funnels and the aft gun, and one right aft at the stern of the ship. These torpedoes had a range of at or at . Two spare torpedoes were carried. Wartime modifications