Waterloo by Andrew Roberts

I think this is the same book as Waterloo: Napoleon's Last Gamble.  It is part of the Making History series by Harper Collins and just meant as an introduction and as such fits the purpose.  Richard lent me his copy and it was an enjoyable, quick read.  One new bit of information, the massed French cavalry charge might have been the result of "irrational exuberance" to use a modern phrase.  Once one excitable cavalry unit moves forward another joins in, in case it might miss out in the glory.

http://www.harpercollins.com.au/9780007190768/waterloo-napoleons-last-gamble

I've read Andrew Roberts Masters and Commanders which was a much more in depth book and have his Napoleon the Great to look forward to for my birthday.