The Battle of Medina was fought approximately 20 miles south of San Antonio de Bexar (modern-day downtown San 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.
Background
Bernardo Gutiérrez de Lara took up the effort to free Texas from Spain. Colonel Gutiérrez visited Washington, D.C., gaining some support for his plans. In 1812, Colonel Augustus Magee, who as a lieutenant had commanded U.S. Army troops guarding the border of the Neutral Ground and Spanish Texas, resigned his commission and formed the Republican Army of the North to aid the Gutiérrez–Magee Expedition. The army flew a solid emerald green flag, thought to have been introduced by Colonel Magee, who was of Scots-Irish descent.
Nacogdoches was taken on August 12, 1812, with little opposition, and on November 7, 1812, the Republican Army of the North marched into what is present-day Goliad, where they took the Presidio La Bahía. The Spanish Army soon confronted them, beginning a four-month siege. While at La Bahia, however, Colonel Magee died (February 6, 1813). After numerous battles and heavy losses, the Spanish lifted the siege and returned to San Antonio de Bexar.
On March 25, 1813, the Republican Army of the North left La Bahia for Bexar after receiving reinforcements. Colonel Samuel Kemper (brother of Reuben Kemper (another soldier very familiar with filibustering) replaced Magee, and Lt. Col. Reuben Ross was elected to second in command.
Battle
There were approximately 1,400 Texians in Lara's Republican Army at the time, composed of Tejanos, Americans, Euro-Mexicans (Criollos), former Spanish Royalist soldiers aided by an auxiliary force of Indians, and at least one black slave. The army, being led by General Toledo, had camped on the north bank of the Medina River, about six miles north of Arredondo's 1,800 Royalist troops that were encamped near present-day Leming, Texas.
The battle lasted for four hours. Toledo's plan called for an ambush on the Royalist troops as they marched through a defile on the Bexar–Laredo road. Similarly, Arredondo had sent out a scouting party with some cavalry in the morning to try to determine the location of Toledo's troops. Quite accidentally, they happened upon the Republican ambush and retreated after a brief exchange of fire.
The Republican soldiers gave chase and apparently mistook the cavalry, which kicked up large clouds of dust, for the main army. It is believed that Toledo tried in vain to stop his troops from advancing. In their pursuit, they were slowed down by the sandy terrain; the guns that dragged with them became deeply mired. When they had reached the Spanish lines, they were tired and thirsty. However, they managed to rout some Spanish artillery units and were attempting a flanking maneuver when they were repulsed by Spanish cavalry units. The situation had been less than clear for Arredondo, who was prepared to order his troops to fall back when he seems to have been informed by a defector that the Republican troops were also attempting to disengage because of exhaustion. He then ordered an advance instead.
The Republicans fled in disorder. Toledo, and a few of his associates headed straight for Louisiana. Some of the combatants stopped in San Antonio just long enough to gather their families. The Spanish army continued to press, killing many of the fleeing soldiers. Most of the remainder were captured and, in a portent of the future Texas War of Independence, were summarily executed. Fewer than 100 out of 1,400 soldiers on the Republican side survived, and the Royalists lost only 55 men. The remains of the Republican troops were left to rot and were not buried until 1822 when José Félix Trespalacios, the first governor of Coahuila y Tejas under the newly established United Mexican States, ordered a detachment of soldiers to gather their bones and bury them honorably under an oak tree that grew on the battlefield.