As referred to in our Advertorial, Bernie Barker is the person who helped John Dudeney open up the sport of tentpegging/mounted skill-at-arms to civilian riders in the UK to take part in. This video was made by Bernie some years ago. He planned to make a complete training film for mounted skill-at-arms and tentpegging.
Sadly this project was never finished but what does exist is both very informative and useful. A great deal has changed in the sport since the video was made. However, the principles have not.