Only the first third of the book can be described as a biography, and this is the most accessible part. Clausewitz rose to major general and fought Napoleon, but never reached the highest command. Appointed head of Prussia's Military Academy in 1818, he spent the rest of his life writing and rewriting his massive work, which remained unfinished and was published posthumously. Few outside the country paid attention until Prussia's astonishing victory over France in 1870. (The first English translation was in 1873). Readers who know Clausewitz's maxim that "war is politics carried on by other means" will yearn for more insights, and the author provides these. Though generals often proclaim wars must end in absolute victory, Clausewitz asserted that in the real world annihilating the enemy is rarely possible and often a bad idea. Strachan works hard at defining what Clausewitz meant, comparing various writings, discussing precise meanings of German words, filling in textual gaps and quarreling with other interpretations.