Clausewitz’s concept of training, however, retains its relevance. It’s the best protection we have against strategies getting stupider as they become grander, a recurring problem in peace as well as war. It’s the only way to combine the apparent opposites of planning and improvisation: to teach the common sense that comes from knowing when to be a hedgehog and when a fox. Where, though, if not in the military and if only inadequately within the academy or on the job, can young people today get such an education?
