https://en.wikipedia.org/wiki/Conscription
> Modern conscription, the massed military enlistment of national citizens, was devised during the French Revolution, to enable the Republic to defend itself from the attacks of European monarchies. Deputy Jean-Baptiste Jourdan gave its name to the 5 September 1798 Act, whose first article stated: "Any Frenchman is a soldier and owes himself to the defense of the nation." It enabled the creation of the Grande Armée, what Napoleon Bonaparte called "the nation in arms," which overwhelmed European professional armies that often numbered only into the low tens of thousands.
That feel when universal conscription wasn't really a thing until French Revolution. That changes my perspective about fearing of kill. Of course professional, paid soldier is more willing to shoot enemy then some peasant forced into military.