►The
development of classical civilizations, with their agricultural surpluses, increased populations, and improved technologies, advanced the business of making war.
►More people
fought and suffered during hostilities.
►In most
contemporary civilizations warfare was little organized and subject to ritual rules.
►Duels between
warrior champions were important.
►Change came
during the late Zhou period when Sunzi
produced a great classic of military theory, The Art of War.