the idea that morale alone could conquer, Foch warned, was an “infantile notion.” From his flights of metaphysics he would descend at once, in his lectures and his prewar books Les Principes de la Guerre and La Conduite de la Guerre, to the earth of tactics, the placing of advance guards, the necessity of sureté, or protection, the elements of firepower, the need for obedience and discipline.
