Fields of Death by Bernard Cornwell Simon Scarrow.
Good so far, and will be right the way through, if his other three about Napoleon and Arthur Wellesley (Duke of Wellington) are anything to go by. I normally like to read "junk" thrillers, but have a soft spot for historical, er, pseudo fiction, I suppose you could call it. It's not completely fictional, nor is it completely fact, but sits somewhere in the middle. Mr Scarrow and Mr Cornwell seem to be the lead purveyors of this kind of gendre, apart from the Sharpe novels....