 In his famous “Bekenntnisdenkschrift” of 1812, he called for a “Spanish war in Germany” and laid out a comprehensive guerrilla strategy to be waged against Napoleon.In "On War" he included a famous chapter on “The People in Arms.”

One prominent critic of Clausewitz is the Israeli military historian Martin van Creveld.In his book "The Transformation of War", Creveld argued that Clausewitz's famous "Trinity" of people, army, and government was an obsolete socio-political construct based on the state, which was rapidly passing from the scene as the key player in war, and that he (Creveld) had constructed a new "non-trinitarian" model for modern warfare.