 Howard and Paret edited the most widely used edition of "On War" (Princeton University Press, 1976/1984) and have produced comparative studies of Clausewitz and other theorists, such as Tolstoy.Bernard Brodie's "A Guide to the Reading of "On War"", in the 1976 Princeton translation, expressed his interpretations of the Prussian's theories and provided students with an influential synopsis of this vital work.The British military historian John Keegan attacked Clausewitz's theory in his book "A History of Warfare".