This is not an easy book to read nor understand. It takes several readings. A large investment in time will allow the reader to understand Clausewitz's system and the remarkable way that it stills aides in understanding the phenomenon of war. The text is adorned with many historical examples. Continuously emphasizing that war is 'a continuity of policy by other means. He has defined perfectly the theory of war, its tactical and strategic purposes. A must for an military or political leader.