Melee and Wizard is a set of rules modifications to allow you to use The Fantasy Trip / Melee / Wizard for mass combat.
Majestic 12 Games has these demo rules for their For the Masses Fantasy miniature wargames system. Here’s their blurb:
For The Masses is a complete fantasy mass-combat wargame system. But it is also much more: The flexibility of the system allows players to use any fantasy setting and armies to play out famous fantastical scenarios and ancient epic battles. Several sample army lists are included in the book but the real strength of For the Masses is the unit creation system. This system encourages players to be creative, use their imagination and have fun, which is the way wargaming should be.
From Chris Gilders comes No Quarter Fantasy Rules. These free wargames rules are a massive work, with 83 pages in the main rules book alone. There also are a large number of army lists, which is the real strength of the set. Like many fantasy games, figures are defined by a model profile, detailing combat stats, actions, strength, toughness and wounds. This is an amazingly comprehensive work for a free rules set, covering every aspect of fantasy warfare you could want.