I really enjoyed Scarrow's centurion novels, but I'd been a little chary of this one - a fictionalised biography of Napoleon and Wellington. I ended up getting it due to being in somewhat of a book drought, and it turns out my fears of it being a little dry were unfounded.
As far as I know, he sticks pretty close to their actual lives. He does admit to making up a few scenes just to make his story better (including an amusing meeting between them when Wellington spent a year at a French military college). There's also a number of scenes that could only have played out as described with the knowledge of what is still to come in both their lives.
Still, it has it's exciting moments and I was disappointed when I got to the end. Hopefully volume two will not be far off (and the next one about the centurions too).