“[American] Civil War was effectively our first industrial-scale war. It led to mass mobilization at the human and economic/industrial levels. It also involved long-distance movements and communications, by train and telegraph, in ways that arguably make it the first modern war. It produced as many American casualties as all the rest of our wars combined, so can hardly be ignored in a book about major U.S. wars. It also illustrated warfare at the campaign or theater level of analysis perhaps more clearly and cleanly than any other conflict.”