At a time when the U.S.-Mexican border was still not clearly defined and when the doctrine of Manifest Destiny and land hunger impelled the Anglo presence ever deeper and more intrusively into South Texas, Juan Nepomucino Cortina cut a violent swath across the region in a conflict that came to be known as The Cortina War. Did this border caudillo fight to defend the rights, honor, and legal claims of the Mexicans of South Texas, as he claimed? Or...