I’ve just posted up the rules that I wrote a while ago to a Wars of the Roses version of Lord of the Rings (Middle Earth) Strategy Battle Game. The rules are just the additional things that you might need like profiles, weapons and some special abilities that will add some Wars of the Roses flavour to a game of Middle Earth Strategy Battle Game.
They’re in no way complete – there’s no rules for heroes, cavalry, Irish Kerns etc, but they do include rules for some of the most typical Wars of the Roses troop types: billmen, longbow archers etc. They’re inspired by other adaptations such as Age of Trebuchet and Legends of the Middle Ages.
The rules can be downloaded in PDF here or you can read them online here.