A genuine military historian completely abandons his area of expertise — and reason — in order to espouse the Lost Cause Myth. Simply reading the reasons Southerners gave for their secession and war is enough to dispute the ideologically-motivated distortions in this book.
He does know a lot of details, and it's a pretty good example of how the Lost Cause Myth continues today. But his reasoning is hopelessly searching to confirm preexisting prejudice, strategically uncurious where curiosity would be hazardous to his beliefs, and his conclusion is flatly wrong.
It's telling that no university would affix their name to this publication.