Defendo is a martial art and self defense system created in 1945 for law enforcement by Bill Underwood, a British-born Canadian. Underwood had created Combato in 1910, a
"non-boxing or wrestling" unarmed combat system which he taught in Montreal, Quebec and Toronto, Ontario and Defendo grew out of this system.
Combato had its beginning in the Liverpool theatres with ju-jitsu demonstrations by traveling Japanese wrestlers, Yukio Tani and Taro Miyake. As a boy, Underwood idolized these experts,
and rapidly established himself as a prodigy.