Richard Holmes, Redcoat: the British Soldier in the Age of Horse and Musket (London, HarperCollins, 2001). Don't know if it's published in the US. Really excellent book, a must-read for anyone interested in the British army c 1750-1850. Author is a Professor of Military Studies in the UK (taught for many years at Sandhurst), on the TV a lot there, and a real enthusiast with a total zest for the stuff.