[Neff] shows us how the legal events of [the Civil War] resulted in the formation of legal principles that today influence American and international legal systems. He brings its history into the 21st century with analyses of terms such as ‘combatants, military tribunals, detention of persons without due process, unlimited incarceration and habeas corpus.’ I frequently had to remind myself that I was reading about the war between the states—not the War on Terror… Neff has included so much in this impressive and useful work… What he has done for legal scholarship in showing the modern relevance of meaningful legal history is deserving of high praise, and of an enthusiastic recommendation for it to be read, especially in governmental houses of justice.