By the summer of 1863, following Chancellorsville, it was clear to everyone on both sides of the Civil War that the Army of Northern Virginia was the most formidable force Americans had ever put in the field. It could only be "tied" in battle, if against great odds, but would more usually vanquish its opponents. A huge measure of that army's success was attributable to its cavalry arm, under Major General J.E.B. Stuart, which had literally "run rings"...