Digby Smith
Originally writing under the pen name, Otto von Pivka, since his retirement from the military he has written another dozen books, venturing into narrative history with his 1813: Leipzig : Napoleon and the Battle of the Nations in 2001 and Charge!: Great Cavalry Charges of the Napoleonic Wars in 2003. His Greenhill Napoleonic Wars Data Book: Actions and Losses in Personnel, Colours, Standards and Artillery, 1792–1815 (1998) is considered a standard for French Revolutionary War and Napoleonic War historians, re-enactors, and hobbyists.
https://en.wikipedia.org/wiki/Digby_Smithhttp://www.napoleon-series.org/greenhill/news/c_pivka.html
Overview
Based on more than thirty years of research, this massively detailed reference work provides comprehensive coverage of every action in every campaign of the Revolutionary and Napoleonic Wars. It includes accurate data on more than two thousand individual battles, clashes, sieges, raids, capitulations, and naval engagements, all listed in chronological order. For every action accurate records are provided as to which units, from corps to company level, fired shots and took casualties. Overall casualties are assessed, and the number of cannon, colours, and standards lost are also given. Drawing from original source material until now unavailable to the general reader, including archives, libraries and private collections across Europe, The Greenhill Napoleonic Wars Data Book is a monumental contribution to our understanding of the conflict.
You must not fight too often with one enemy, or you will teach him all your art of war