From the back of the book:
"The Ronin Wars. The Andurien/Magistracy invasion of House Liao. The Anton Revolt and subsequent Marik Civil War. Against the empire-spanning conflicts of the Fourth Succession War, Clan Invasion and FedCom Civil War, historians all too often forget such important conflicts, relegating them to the category of "low intensity warfare." Yet it is these very conflicts that tend to shape the internal politics and culture of each faction, often with more profound impact than the largest wars.
The Historical: Brush Wars campaign sourcebook details the actions involving every line unit in the most important "low level conflicts" of the early thirty-first century. Maps and full regiment listings convey additional details, while ample campaign rules provide a framework allowing players to replay every detail of each war."