上海公共租界巡捕房
Close Quarters Combat System (i.e. Defendu) is a modern martial art developed by William E. Fairbairn and Eric A. Sykes prior to World War II. It is a hand-to-hand combat system based on practical experience mixed with Jujutsu and boxing that was developed to train the Shanghai Municipal Police, and was later taught in expanded form to Office of Strategic Services and Special Operations Executive members during World War II.