For the Texas Rangers, the Mexican-American War was an opportunity for vengeance. When the United States declared war on Mexico in 1846, the Texas Rangers were eager to settle scores with their familiar foe and quickly became the eyes and ears of the US army. Commanded by established legends like Samuel H. Walker, Benjamin McCulloch, and John "Jack" Coffee Hays, Texas Rangers led the American charge at Monterrey and saved General Taylor's army at Buena Vista. However, their depredations on Mexican citizenry were often excessive, and their behavior, along with other volunteers, sparked Mexican resistance. However crucial they were to US victory, it is also indisputable that they earned a reputation for brutality even in a vicious war.. Author William Nelson Fox follows these larger than life figures into stories of heroism and villainy at the heart of the Mexican-American War.