This book at last makes available a penetrating exchange between two of history's most famous soldiers concerning the dramatic events of the Waterloo campaign of 1815. The Duke of Wellington is considered one of the greatest military commanders in British history; General Carl von Clausewitz is often seen as the greatest military thinker in the history of Western civilization. Both men were prominent participants in the campaign of 1815. The book is built around a new and complete translation of Clausewitz's study of the Waterloo campaign (published in Berlin in 1835) and Wellington's detailed 1842 response to it. The controversial exchange between these two brilliant soldiers was famous in the 19th century, but it was never published in English and has been suppressed since 1914. The book contains Wellington's initial battle report; two of Clausewitz's post-battle letters to his wife Marie; correspondence within Wellington's circle concerning Clausewitz's work; Clausewitz's campaign study; Wellington's memorandum in response; and enlightening essays by the editors.