During the Chickamauga Campaign, General Stanley's two Union cavalry divisions battled Forrest's and Wheeler's cavalry corps in some of the most difficult terrain for mounted operations. The Federal troopers, commanded by Crook and McCook, guarded the flanks of the advance on Chattanooga, secured the crossing of the Tennessee River, then pushed into enemy territory.
The battle exploded on September 18 as Col. Minty and Col. Wilder held off a determined attack by Confederate infantry. The fighting along Chickamauga Creek included notable actions at Glass Mill and Cooper's Gap. Union cavalry dogged Wheeler's forces throughout Tennessee. The Union troopers fought under conditions so dusty they could hardly see, leading the infantry through the second costliest battle of the war.
Best seen as an adjunct to Peter Cozzens' "This Terrible Sound: The Battle of Chickamauga" (after thirty years still the best book on the battle), Belcher aims to give you a comprehensive study of the Union cavalry in this campaign, making the argument that under David S. Stanley the cavalry arm of the Army of the Cumberland achieved a high level of efficiency, and had a significant impact in terms of staving off total disaster for General Rosecrans and his men. I particularly liked the order of battle information and the tactical maps that were drawn up for this book.
Less good is that I have a little bit of doubt about an author who can consistently refer to the U.S. National Archives and Records Administration as the "National Archives Records Administration," and I do note some inconsistencies in how Belcher cites records from NARA. Now you might say that I'm just prejudiced since I spent 30-odd years working in reference for NARA, but sloppy citations are the bane of the archivist's existence. This is not to mention that this study is basically a mountain of minutiae, so any slop at all makes one suspicious. Still worth looking at if you're an experienced student of the American Civil War.