The battle of Concepción was fought on October 28, 1835, between Mexican troops under Colonel Domingo Ugartechea and Texian patriots led by James Bowie and James Fannin. The 30-minute engagement, which historian J. R. Edmondson describes as "the first major engagement of the Texas Revolution", occurred on the grounds of Mission Concepción, 2 miles (3.2 km) south of now Downtown San Antonio in the U.S. state of Texas.
On October 13, the newly created Texian Army under Stephen F. Austin had marched towards Bexar, where General Martín Perfecto de Cos commanded the remaining Mexican soldiers in Texas. On October 27, Austin sent Bowie and Fannin, with 90 soldiers, to find a defensible spot near Bexar for the Texian Army to rest.