A broad group of people helped enormously by reading and re-reading each chapter as it was written until a broad consensus arose that it was accurate in content and readable in style. 
The Research Team for the book
From the start I relied on help; people like Madame Deloget and Madame Ghislaine Mattias who tracked down families and spent many hours interviewing witnesses. In the latter stages of the research military experts like David Lehmann, Louis Capdebosq and Alain Barrault in France and Major Andy Carnachon and Lt Colonel John Starling in Britain.
