"[I]t was the inner elite (the general staff) of one of the most caste-bound and privileged officer corps in Europe—the Prussian—that was the first to succumb to the new world of industrial change, and transform itself into a group of "industrial" managers and technicians... Railway transport, swift mobilization, and new equipment called for a high degree of technical skill and competence. Education and intelligence in conscripts required the same attributes in officers. Above all, the Prussian army, in the era of Moltke, Roon, and Bismarck, was the key to Prussian unification of Germany; neither the officer corps nor the nation could afford it to be less than efficient and modern. By 1870 the revolution was almost complete; the first European army of the modern era had been seen in action in three swift wars."