I think there is an issue of semantics here. I think of WWI as the first industrial war because I think it is the first time that killing achieved an industrial efficiency in transforming people into corpses with the use of machinery. Maybe its a matter of degree but the efficiency of high explosives, long range artillery, machine guns, and poison gas to kill people smack of a industrial process that makes the civil war's technology of killing look much more hands on and craftsman like, if you can use that word, even if the weapons themselves were the result of industrial process's. Sort of like a steel hand plane vs a thickness planer or gas welding vs a mig robot.