An Infamous Army is a novel by Georgette Heyer. In this novel Heyer combines her penchant for meticulously researched historical novels with her more popular period romances. So in addition to being a Regency romance, it is one of the most historically accurate and vividly narrated descriptions of the Battle of Waterloo. An Infamous Army completes the sequence begun with These Old Shades, (although there is an inconsistency in the time line, with These Old Shades set in 1755, Devil’s Cub set 25 years later, with only 35 years until the setting of An Infamous Army, during which time there is supposed to be two grown generations) and is also a sequel to Regency Buck.
Source:Wikipedia