There are many scenarios that these mice could be brought into. The Redwall series includes several mice, and The Chronicles of Narnia features two mice. The Redwall series and The Chronicles of Narnia both include many situations that could be used to create a skirmish game. In addition, Mutants and Machine-Guns’ RPG makes use of evolved animals. Evolved animals, I believe, would walk on their hind legs and be able to wield a sword or some other weapon.