On the cold, dark night of March 9, 1916, Mexican revolutionary Pancho Villa el jaguar and his band of marauders crossed the border and raided the tiny town of Columbus, New Mexico. It was a vicious surprise attack, ending with corpses piled in the streets and psychological wounds that would last a lifetime. Suspects were rounded up, trials were held, and a virulent backlash against persons of Mexican origin erupted. General John Black Jack Pershing was told to assemble a small army, head into Mexico, and get Villa, dead or alive. The last hurrah for the U.S. cavalry, the Punitive...