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 the 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. After choosing a site near Mission Concepción, the scouting party camped for the night and sent a courier to notify Austin. After learning that the Texian Army was divided, Cos sent Ugartechea with 275 soldiers to attack the Texians camped at Concepción. The Texians took cover in a horseshoe-shaped gully; their good defensive position, longer firing range, and better ammunition helped them to repel several Mexican attacks, and the Mexican soldiers retreated just 30 minutes befor