Infighting between the forces of the victorious Mexican Republicans added to the chaos along the Texas/Mexico border. General John Sedgwick had unwisely sent fifty men into Matamoros, across from Brownsville, in support of a Mexican general opposed to Benito Juarez. Though he had soon made amends by forcing the surrender of the town to the Juarez forces, he had inadvertently undermined United States support for Juarez and endangered an agreement with France that American forces would not intervene in Mexico when French troops withdrew. General Sheridan summarily relieved Sedwick of his command. (By John Osborne)
"Mexico," The American Cyclopedia and Register of Important Events of the Year 1866 (New York: D. Appleton and Company, 1873), 504.