I do recall reading of families watching some battles of the Civil War, on hills overlooking the battlefield, as if at some sporting event.
I goes back to the Renaisance when soldiers were mercenaries and even the Middle Ages when knights did the fighting. The horror and carnage of WWI and WWII was due to the total war, mass mobilization started by Napoleon. Is is interesting to hear dems argue that would be better, again. No, it would not.
First Bull Run. There were U.S Congressmen and others who came by carriage to picnic and watch the battle. Most left, sans picnic basket, the same way, albeit faster.