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 what is now Downtown San Antonio in the U.S. state of Texas.