From the back of the book:
Death Destruction & Mayhem... the Way of the Warrior!
How do monsters and magic affect weapons, armour and fighting styles?
Martial Law breaks new ground in the field of fantasy role playing combat rules. Martial Law expands the fast dramatic combat of HARP (High adventure Role Playing) to include detailed location criticals.
Martial Law also includes a section on creating and playing warriors in fantasy settings and cool new moves and equipment for fighters.