This is their titled blurb posted at Paizo's forum.
Here is the relevant thread. Of note are the posts by Hank Woon himself on how the system works. It is on sale from Paizo and Adamant's own site, although Adamant's site is currently under a redesign, so that link doesn't work right now.The clash of grand armies comes to your game world! Designed by Hank Woon (Pathfinder Roleplaying Game Core Rulebook, Pathfinder Roleplaying Game Bestiary) and extensively playtested, WARPATH is a complete set of rules designed to give Game Masters and players all the tools they need to run anything from a tiny border skirmish to an all-out epic battle involving thousands of soldiers. The rules can be used for units as small as one to as many as needed, and is designed to be fully compatible with the Pathfinder Roleplaying Game system.
The 96-page rulebook contains rules for:
* Unit Design
* Combat and Tactics
* Battlefield Maneuvers
* Spells and Spell-like Abilities
* Army Leaders
* Battlefield Design and Set-up
* Casualties, Prisoners and Consequences
* Siege Warfare and Fortifications
* A Quick-play version of the rules for fast results
* Campaign rules, example units and battlefields, and More!
As we have a major siege going on at Tir Castellan and some major battles coming up with Manath, I thought these rules might be useful. Or not. They are also supposed to be a fun game in their own right.