La campagne de 1799 en Italie et en Suisse by Carl von Clausewitz, Henri Albert Niessel. 2 vols. Published by R. Chapelot et cie., 1906:

Vol 1:
http://books.google.com/books?id=8tNCAAAAYAAJ

Vol 2:
http://books.google.com/books?id=JdRCAAAAYAAJ

German edition:

Die Feldzüge von 1799 in Italien und der Schweiz by Carl von Clausewitz. Volumes 5-6 of Hinterlassene Werke über Krieg und Kriegführung. Publisher F. Dümmler, 1833-1834:

Vol 1:
http://books.google.com/books?id=g6sWAAAAQAAJ

Vol 2:
http://books.google.com/books?id=sasWAAAAQAAJ