"No. 7"--as Carpenter, the youngest of seven children, called himself--was born in Missouri in 1854 and moved west with his family, first to Kansas, then to the settlements near Pikes Peak, and finally, in 1872, to Texas with his elder brother. From the time he made his first cattle drive, he wanted no other life but that of herding longhorns across the free and flat grasslands of the West. His schooling was the trail, the campfire, the saddle. In 1900, after a full and active life, he retired to his own ranch west of the Pecos. As the years passed, he sadly watched the fences go up and...