Swordfighting reference

Does anyone know any good reference source for swordfighting. I have a project where i plan to rotoscope character animations similar to this at link below.

I've tried to google but didn't find much good resource material. Any help appreciated.

Or Maybe better to record my own?

I find the subject of actual swordfighting quite interesting.

I would avoid using video material of hollywood movies about sword fighting and rather focus on tutorials about sword fighting like it has actual been done in medieval times. Just search for 'medieval sword fighting techniques' on YouTube and you'll find some techniqual sophisticated sword fighting material.

Btw, Archer looks great.