On War Vol 1 Of 3 Carl Von Clausewitz J J Graham Transl by Carl Von Clausewitz, J. J. Graham; (transl.) 9781775419266, 1775419266 instant download after payment.

Carl Philipp Gottfried (or Gottlieb) von Clausewitz (1 July 1780 – 16 November 1831) was a Prussian general and military theorist who stressed the "moral", in modern terms meaning psychological, and political aspects of waging war. His most notable work, Vom Kriege ("On War"), was unfinished at his death.

Clausewitz's thinking is often described as Hegelian because of his dialectical method; but, although he was probably personally acquainted with Hegel, there remains debate about whether Clausewitz was influenced by him.  He stressed the dialectical interaction of diverse factors, noting how unexpected developments unfolding under the "fog of war" (i.e., in the face of incomplete, dubious, and often erroneous information and great fear, doubt, and excitement) call for rapid decisions by alert commanders. He saw history as a vital check on erudite abstractions that did not accord with experience. (…) he argued that war could not be quantified or reduced to mapwork, geometry, and graphs. Clausewitz had many aphorisms, of which the most famous is "War is the continuation of policy with other means."

< source: https://en.wikipedia.org/wiki/Carl_von_Clausewitz >