It’s an ambitious title, but military historian John Keegan is up to the task. In A History of Warfare, Keegan analyzes the role of warfare in society, and the progression of war through four “ages” which he characterizes as “stone, flesh, iron and fire.” Most interesting is that Keegan refutes von Clausewitz’s contention in “On War” that war is simply an extension of national policy. While this is not a book about any particular war or battle, the thoughtful wargamer will find this interesting for the ideas and questions it poses.