The Bristol Bulldog was a British Royal Air Force (RAF) single-seat biplane fighter designed during the 1920s by the Bristol Aeroplane Company, with over 400 Bulldogs produced, that arguably became the most famous aircraft during the RAF's inter-war period.
The full-production Bulldog came in the form of the Mk.II, which had a modified structure but in every other respect was identical to the original Bulldog; having two 0.303 in (7.7 mm) Vickers machine guns; a capacity for four 20 lb (10 kg) bombs; a 450 hp (340 kW) Bristol Jupiter radial engine; giving the Bulldog a maximum speed of just under 180 mph (290 km/h) and a range of 300 mi (480 km). The aircraft then entered production in 1928, entering service the following year, and becoming, during the early 1930s, the most widely used aircraft in the RAF. It was cheap to maintain and thus, at a time of defense budget constraints, was the more preferable option to any other competitors. The Mk. IIA was again virtually similar to its predecessor, though it had a new Jupiter engine and a strengthened structure.
The Bulldog never saw combat with the RAF, though during the Abyssinia Crisis of 1935-36, Bristol Bulldogs were sent to the Sudan to reinforce Middle East Command. Douglas Bader, better known for his Second World War actions, lost both of his legs when his Bristol Bulldog crashed while he was performing unauthorized flying Aerobatics at Woodley airfield near Reading.
Source: Wikipedia, "Bristol Bulldog", available under the CC-BY-SA License.