Q. Is there an audio book on Clausewitz' On War?

Yes: Clausewitz's On war [electronic resource] : a biography / Hew Strachan. by Strachan, Hew. [Solon, Ohio] : Playaway Digital Audio : [Manufactured and distributed by] Findaway World, LLC, [2009], p2007. Call No.: U102.C6643 S72 2009d Also: On war [electronic resource] / Carl von Clausewitz ; edited, abridged and revised by F.N. Maude ; [tranlated by Col. J.J. Graham]. by Clausewitz, Carl von, 1780-1831. [Solon, Ohio] : Playaway Digital Audio : [Manufactured and distributed by] Findaway World, LLC, [2009], p1990. Call No.: U102 .C65 2009d