Clausewitz's original book, Der Feldzug von 1815 in Frankreich, is vol.8 of his collected works. Although the Duke of Wellington wrote a famous reply to it in 1842, it had never been published in English. In 2010, two translations appeared. The first was Carl von Clausewitz and Arthur Wellesley, first Duke of Wellington, On Waterloo: Clausewitz, Wellington, and the Campaign of 1815, ed./trans. Christopher Bassford, Daniel Moran, and Gregory W. Pedlow (Clausewitz.com, 2010). This book is built around a full, modern translation of Clausewitz's campaign study and includes Wellington's reply, additional materials from Clausewitz and Wellington's circle, and essays by the editors (all recognized scholars in the field). The second was Carl von Clausewitz, On Wellington: A Critique of Waterloo, ed. Peter Hofschröer, ed. (Norman, OK: University of Oklahoma Press), which contains only Clausewitz's campaign study and Hofschröer's own introduction.