Book excerpt: From the humble beginnings of a frontier army camp, Fort Worth transformed into a city as cattle drives, railroads, oil and national defense drove its economy. During the tremendous growth, the landscape and cultural imprint of the city changed drastically, and much of Cowtown was lost to history. Witness the birth of western swing music and the death of a cloud dancer. See mansions of the well-heeled and saloons of the well-armed. Meet two gunfighters, one flamboyant preacher, one serial killer and one very short subway carrying passengers back in time to discover more of Fort Worth. Author Mike Nichols presents a colorful history tour from the North Side to the South Side's Battle of Buttermilk Junction.