From the introduction:

To those unacquainted with military history, [this book] provides an elementary, instructive, and readable military account of the American Civil War. The basic concepts of war, its conduct, management, and support, are thoroughly explained and explicitly applied throughout in order to make clear what many authors often incorrectly take for granted that readers already know. . . .

We have tried to tell the military history of the war from the viewpoint of the higher commanders on both sides. We therefore emphasize strategy and logistics rather than tactics. . . .Strategy, management, and execution weigh more than superior numbers and resources in dictating the outcomes of wars, and the Civil War is no exception. The weaker side can win; the South almost did.