From the back cover:

"Life is cheap. BattleMechs are expensive." - Advertising slogan, Irian BattleMechs Ltd.

Welcome to the year 3056. The Successor States of the Inner Sphere battle each other and their deadliest enemies, the invading Clans, in endless wars that rage across the Known universe. These epic conflicts are won and lost by BattleMechs, 30-foot tall, humanoid titans of metal that pack enough firepower to destroy entire cities.

BattleTech celebrates its tenth anniversary with the BattleTech Compendium: The Rules of Warfare, the ultimate guide to combat in the 31st century. All the rules needed to simulate exciting conflicts between BattleMechs, vehicles, and infantry are included, revising and streamlining the material from from the BattleTech, 3rd Edition, CityTech, 2nd Edition and the original BattleTech Compendium. The Rules of Warfare also contains a concise history of the BattleTech universe and its movers and shakers, several new BattleMech and OmniMech designs, rules for miniatures play, and full-color illustrations.

User comment:

Three English editions of this rulebook were released at the same time celebrating 10 years of BattleTech. It was the first over-arching BattleTech rules compendium to remove Land-Air 'Mechs (LAMs) from the standard ruleset, while also dropping all of the AeroTech rules, which were updated seperately and issued as AeroTech 2.