Captain Bill McDonald (1852–1918) is the most prominent of the "Four Great Captains" of Texas Ranger history. His career straddled the changing scene from the nineteenth to the twentieth centuries. In 1891 McDonald became captain of Company B of the Frontier Battalion of the Texas Rangers. "Captain Bill" and the Rangers under his command took part in a number of incidents from the Panhandle region to South Texas: the Fitzsimmons-Maher prizefight in El Paso, the Wichita Falls bank robbery, the murders by the San Saba Mob, the Reese-Townsend feud at Columbus, the lynching of the Humphries clan, the Conditt family murders near Edna, the Brownsville Raid of 1906, and the shootout with Mexican Americans near Rio Grande City.

Harold J. Weiss, Jr., seeks to find the true Bill McDonald and sort fact from myth. McDonald's motto says it all: "No man in the wrong can stand up against a fellow that's in the right and keeps on 'a-comin'."