First edition published by Ambush Alley Games.
From the back of the book:
Force on Force provides wargamers with the tools they need to game engagements between forces ranging in size from a couple of squads to a company plus in any period from 1900 to the near future! Unified, elegant mechanics encourage and reward the use of real-life tactics and produce realistic results while still supplying a fast, fun game. Our unique Fog of War system injects a nerve-testing dose of chaos into each game, pitting player commanders against some of the expected challenges that their real-life counterparts face in combat and ensures that no scenario plays exactly the same twice.
Force on Force can be played with miniatures of any scale and is designed to use only as much table space as players desire.
This core rulebook focuses on contemporary warfare but includes rules for use with World War Two scenarios as well.