CONCEPCIÓN, BATTLE OF.The battle of Concepción occurred on October 28, 1835, the opening engagement in the siege of Bexar.After the skirmish at Gonzales on October 2 (the battle of Gonzales), the Texas army under Stephen F. Austin grew to 400 men as it advanced on San Antonio.Gen. Infobox Military Conflict conflict=Battle of Concepción caption= partof=the Texas Revolution date=October 28, 1835 place= Mission Concepción, San Antonio de Bexar result=Texian victory combatant1=Texian insurgents combatant2=Mexico… The Battle of Concepción was the first major armed conflict of the Texas Revolution. Rebel Texans, led by James Fannin and Jim Bowie, fought off a vicious assault by … It took place on October 28, 1835, on the grounds of Concepción Mission outside of San Antonio.