Interesting little book from a fascinating man. Feldenkrais was in Britain inthe early 1940's, and was asked to train the Home guard. The Home Guard was an auxillary back up if you will to the regular army. As Britain was expecting to be invaded by the Nazis(Operation Sea Lion), even the men and women who were not in the army were deeply involved in patrolling and protecting England.
Feldenkrais wanted something simple and effective that could be taught to large groups in a short period of time. Rather than developing a POI based on striking, such as Fairbairn/Appplegate/Sykes, he developed a system based around a single technique, the rear naked choke. His choke is somewhat modified from the standard judo choke, as the intent is to literally take someone out.
His book shows various ways of getting into RNC from in front, the side, the back, against a taller person, armed with a rifle and bayonet, etc.
This book was at one time reprinted by the Feldenkrais society, as are his excelent judo books, but is no longer available. A rare and interesting book on a different version of WWII Combatives than most of us are familiar with.