May I recommend something completely different, The Letters of Private Wheeler, 1809-1828. He fought with Wellington's army throughout most of the Peninsula Campaign and, although having only a basic education, writes vividly of the experiences of the ordinary soldier. In fact, he write so well, that John Keegan said. "In a later age he would have become a successful war correspondent... He was one of military history's great originals".
You can buy the book from Amazon and Waterstones, and I highly recpmmend it.