Following his study of the astonishing range of French Royalist and foreign mercenary units employed by Britain in the period 1793-1802 (Men-at-Arms 328), the author describes often for the first time in an English language publication the part played by their successors during the crucial years of the Napoleonic Wars. He covers not only relatively well-recorded units, such as Roll's, Meuron's and Watteville's Swiss corps, but also the unjustly neglected Italians, Corsicans and Greeks, and such exotica as the African and Ceylon regiments. Uniform details of nearly 40 corps are based on impressive primary research, and this book and its companion volume make a genuinely new contribution to Napoleonic studies.