The game “Japanese Art of War” is based on a core set of rules called the “Universal Skirmish Rules.” This document contains both USR and JAoW.
The first section contains the USR and the second section gives the specific information for the JAoW. These rules are for skirmish wargaming with large scale (≅28mm) miniature figures. Larger or smaller figures can be used with some work. At least one game was run successfully at 54mm with a minor change in ranges. These rules work with warfare from all ancient periods and may be adapted to other periods. Considering the initial inspiration came from a science fiction board game I think it would be easy to apply these to many odd and unusual gaming universes. I fully encourage you to explore those possibilities and spread your work and tales of your experience. These rules are open and you are given license to push the envelope in any direction you want.