So far I have managed to get half way through "Crisis of Command in the Army of the Potomac". It deals primarily with the last six months of the Civil War and with the destruction of Jubal Earlys' Army in the Shennandoah Valley by Sheridan. It is also the biography in sorts of three Union Generals, Averell, Torbert, and Warren who ran afoul of Sheridan and his new concept of War. So far it is quiet intriguing
and if you are an affectioniado of the Civil War well worth reading.