Waterloo: The History of Four Days, Three Armies, and Three Battles by Bernard Cornwell

On June 18th 1815 three armies descended on an unremarkable valley south of the town of Brussels. On the one side, Napoleon Bonaparte, exiled Emperor of the French anxious to retake the empire he had conquered and lost. Opposing him were Arthur Wellesley, Duke of Wellington and Field Marshall Gebhard von Blucher. Already beaten once before, it is here that the allies need to make their stand or all will be lost. Three armies, three great generals, and three battles that would merge into one epic struggle for glory, power, and the fate of Europe and possibly the world!