Amazon.com description: Product Description: A horse's great physical strength yet peaceful nature has made it man's ideal working partner throughout history. From taming the Wild West to herding cattle, horses have helped people overcome their biggest challenges. In rich narrative detail, Working Horses details how these gentle giants have played a role in almost every part of our work lives, from hauling logs and heavy farm machinery to performing for audiences. Shouldering our heaviest burdens, horses have transported everything from royal chariots to covered wagons. Is it any wonder that even today an engine's strength is measured in horsepower?