methods with the knife and bayonet remain common in modern military training, though the importance of formal training declined after 1918. By 1944 some German rifles were being produced without bayonet lugs. Modern hand-to-hand combat techniques Close Quarters Combat (CQC), or World War II combatives, was largely codified by William Ewart Fairbairn and Eric Anthony Sykes. Also known for their eponymous Fairbairn–Sykes fighting knife, Fairbairn and Sykes had worked in the Shanghai Municipal Police of the International Settlement (1854–1943) of Shanghai in the 1920s, widely acknowledged as the most dangerous port city in the world due to a heavy opium trade run by organized crime (the Chinese Triads). CQC was derived from a mixture of judo, jujutsu, boxing, savate, wrestling and street fighting. After the May Thirtieth Movement, Fairbairn was charged with developing an auxiliary squad for riot control. After absorbing the most appropriate elements from a variety of martial arts experts, from China, Japan and elsewhere, he condensed these arts into a practical combat system he called Defendu. He and his police team went on to field test these skills on the streets of Shanghai; Fairbairn himself used his combat system effectively in over 2,000 documented encounters, including over 600 lethal-force engagements. The aim of his combat system was simply to be as brutally effective as possible. It was also a system that, unlike traditional Eastern martial-arts that required years of intensive training, could be digested by recruits relatively quickly. The method incorporated training in point shooting and gun combat techniques, as well as the effective use of more ad hoc weapons such as chairs or table legs. During the Second World War, Fairbairn was brought back to Britain, and, after demonstrating the effectiveness of his techniques, was recruited to train the British commandos in his combat method. During this period, he expanded his 'Shanghai Method' into the 'Silent Killing Close Quarters Combat method' for military application. This became standard combat training for all British Special Operations personnel. He also designed the pioneering Fairbairn–Sykes fighting knife, which was adopted for use by British and American Special Forces. In 1942, he published a textbook for close quarters combat training called Get Tough. U.S. Army officers Rex Applegate and Anthony Biddle were taught Fairbairn's methods at a training facility in Scotland, and adopted the program for the training of OSS operatives at a newly opened camp near Lake Ontario in Canada.