Tennessee’s Radical Army

Intrigued as I am with the dynamics of counterrevolution, this new book looks like a goldmine: Tennessee's Radical Army: The State Guard and Its Role in Reconstruction, 1867-1869. The publisher says,
... the State Guard ... [offset] ... the Klan [which] terrorized large portions of the state. The State Guard was not deployed in 1868, and both the Republican party and freedmen suffered as a result."
These reviewers note,
... the State Guard [was created] in order to enforce the law and protect the Reconstruction process along with a law giving the right to vote to male African Americans.
Disbanded in 1868, it exists today outside of the National Guard system.