Earl J. Hess is Stewart W. McClelland Chair in history at Lincoln Memorial University. He is author of many books on the Civil War, including, most recently, The Civil War in the West: Victory and Defeat from the Appalachians to the Mississippi.
The linear system was far from an outdated relic that led to higher casualties and prolonged the war. Indeed, regimental officers on both sides of the conflict found the formations and maneuvers in use since the era of the French Revolution to be indispensable to the survival of their units on the battlefield. The training soldiers received in this system, combined with their extensive experience in combat, allowed small units a high level of articulation and effectiveness.
Unlike much military history that focuses on grand strategies, Hess zeroes in on formations and maneuvers (or primary tactics), describing their purpose and usefulness in regimental case studies, and pinpointing which of them were favorites of unit commanders in the field. The Civil War was the last conflict in North America to see widespread use of the linear tactical system, and Hess convincingly argues that the war also saw the most effective tactical performance yet in America's short history.