Prussian–German General Staff
Prussia's defeats at Jena and Auerstedt in 1806 opened a contested effort to select and educate officers for judgment rather than birth alone. The resulting staff system joined historical study, mapping, exercises, troop rotation, railway planning, and bounded delegation; it improved operational capacity without making strategy politically legitimate, socially inclusive, or morally neutral. Imperial planning for a western offensive through Belgium in 1914, the plan's failure, and the sharply different staff bodies of the Weimar and Nazi periods show why technical inheritance must be separated from constitutional authority, war aims, outcomes, and later myth.
What happened when Prussian reformers tried to make military judgment survive individual commanders—and who governed the purposes that professional competence made executable?