Lieutenant Colonel William Ewart Fairbairn (; 28 February 1885 – 20 June 1960) was a British soldier and police officer. He developed hand-to-hand combat methods for the Shanghai Police during the interwar period, as well as for the Allied special forces during World War II. He created his own fighting system known as Defendu. Notably, this included innovative pistol shooting techniques and the development of the Fairbairn–Sykes fighting knife.
Military career
Fairbairn served with the Royal Marine Light Infantry starting in 1901, and joined the Shanghai Municipal Police (SMP) in 1907. He served in one of the red light districts. During his service with the International Police in Shanghai, Fairbairn reportedly engaged in hundreds of street fights in the course of his duties during a twenty-year career. Much of his body, arms, legs, torso, even the palms of his hands, were covered with scars from knife wounds from those fights. Fairbairn later created, organised, trained and commanded a special anti-riot squad for the Shanghai police force. He also developed numerous firearms training courses and items of police equipment, including a special metal-lined bulletproof vest designed to stop high-velocity bullets from the 7.63x25mm Mauser pistol. He trained British, American and Canadian Commandos and No. 2 Dutch Troop 10th Inter-Allied Commando forces, US Rangers candidates, and personnel of the Office of Strategic Services (OSS), mainly for close-combat, pistol-shooting and knife-fighting techniques. Fairbairn emphasised the necessity of forgetting any idea of gentlemanly conduct or fighting fair: "Get tough, get down in the gutter, win at all costs... I teach what is called 'Gutter Fighting.' There's no fair play, no rules except one: kill or be killed," he declared. He developed his own fighting system—Defendu—and taught it to members of that police force in order to reduce officer fatalities. He described this system as based primarily on his personal experience, which according to police records included some 600 non-training fights, by his retirement at age 55 from the job of Assistant Commissioner in 1940.
In 1951, he went to Cyprus to train police and in 1952 (and 1956) Fairbairn provided training to the Singapore Police Force's Riot Squad unit, which is now Police Tactical Unit.
Weapons innovations
Together with Eric A. Sykes, Fairbairn developed innovative pistol shooting techniques and handgun specifications for the SMP which were later disseminated by their book Shooting to Live With the One-Hand Gun (1942), along with various other police innovations such as riot batons, armoured vests, and other equipment.
He is perhaps known best for designing the famous Fairbairn–Sykes fighting knife, or 'Commando' knife, a stiletto-style fighting dagger used by British Special Forces in the Second World War, and featured in his textbook Scientific Self-Defence.