There are 3 sets of rules with this name.
Medieval Skirmish Rules[]
One figure = one man one inch = 10ft one move = about 30 seconds.
http://www-personal.umich.edu/~beattie/medsk.html
Medieval Skirmish Rules[]
Fast play skirmish rules. Originally created for Wars of the Roses games.
http://www.lloydianaspects.co.uk/wargames/skirmish/rosewar.html
Leaders and Duelling : Add on for the Medieval Skirmish rules.
Medieval Skirmish Rules[]
Quick play medieval rules.