How does the Battle of Medina relate to Mexico becoming independent from Spain

The Battle of Medina was fought approximately 20 miles south of San Antonio de Bexar (modern-day downtownSan Antonio in the U. S. state of Texas) on August 18, 1813, as part of the Mexican War of Independence against Spanish authority in Mexico. Spanish troops led by General José Joaquín de Arredondo defeated republican forces (calling themselves the Republican Army of the North), consisting of Tejano - Mexican and Tejano-American revolutionaries participating in the Gutiérrez-Magee Expedition, under General José Álvarez de Toledo y Dubois. It was the deadliest battle in Texas History.