The deadliest campaign of vigilante justice in American history erupted in the Rocky Mountains during the Civil War when a private army hanged twenty-one troublemakers. Hailed as great heroes at the time, the Montana vigilantes are still revered as founding fathers. Frederick Allen's sharply drawn characters, illustrated by dozens of photographs, are woven into a masterfully written narrative that will change textbook accounts of Montana's early days--and challenge our thinking on the essence of justice.