Dennis Hart Mahan was the Military Tactics Instructor at West Point for 41 years. He taught over 900 cadets who would fight in the American Civil War. Most of the 445 Civil War generals, 294 who fought on the Union side and 151 who fought for the Confederates, were cadets who were taught by Mahan. He taught Napoleanic tactics featuring fighting in lines opposite the enemy.Critics say Mahan was responsible for an excessive amounts of casualties using...