Carl von Clausewitz was a Prussian general and military theorist. On War (also widely known by its German name Vom Kriege) is considered to be Clausewitz’s magnum opus, despite the fact it remained unfinished at the time of his death. 

Published posthumously between 1832 and 1835 by Clausewitz’s wife, On War delivers a deep insight into various concepts and schools of thought connected to war. Using a vast amount of historical examples, Clausewitz explores the political, philosophical, and ethical implications of war.