Based on his training in boxing, wrestling, savate, early Judo at the Kodokan in Tokyo, and fights he was involved in during his police work, Fairbairn began to develop his own system of
hand to hand combat, calling it "Defendu".
It was designed to be simple to learn and to provide effective results. Fairbairn published his book, Defendu, in 1926 (re-printed as Scientific Self Defence in 1931), illustrating this
method and it is here that the term "Defendu" first appeared.