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In page Martial arts:
"During the World War II era William E. Fairbairn and Eric A. Sykes were recruited by the Special Operations Executive (SOE) to teach their martial art of Defendu (itself drawing on Western boxing and Jujutsu) and pistol shooting to UK, US, and Canadian special forces. The book Kill or Get Killed, written by Colonel Rex Applegate, was based on the Defendu taught by Sykes and Fairbairn. Both Fairbairn's Get Tough and Appelgate's Kill or Get Killed became classic works on hand-to-hand combat.[citation needed]
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