"On War constitutes the most important single work ever written on the subject. It has inspired general staffs, radical thinkers like Marx and Mao Tse-tung, and (with the start of the Cold War) jargon-ridden American academic studies of "strategy", huge in size but low in payload. Yet, oddly enough, Clausewitz figures little in university courses on political thought. Why Burke, Rousseau and J.S. Mill, but not Clausewitz? It is because his analysis is far too politically incorrect to be acceptable to the liberal mindset that has prevailed in Western academia since the mid-19th century. But such is Clausewitz's continuing power that small-l liberals even including, sad to say, John Keegan, author of this year's Reith Lectures – are at vast pains to dismiss his thinking as irrelevant, outmoded, dangerous or, absurdly, amoral."