Fantastic one stop shop for the uniforms and flags (and a lot more to be honest) for the hundred days campaign.
http://centjours.mont-saint-jean.com/
Ta La
That's useful.
Which 100 days?
If you go to the Blucher part of Sam Mustapha's Honour website you can download the 100 days expansion for free, which includes a game friendly map of the entire region.