Texian militia and Mexican regular army troops under the command of Gen. Domingo Ugartechea skirmished at the battle of Concepción on the grounds of Mission Conception near San Antonio de Bexar.  The skirmish was the opening engagement in the siege of Bexar and is considered by historians to be the first major conflict of the Texas Revolution. The Texians were commanded by James Bowie and James W. Fannin, Jr.  When Ugartechea’s forces approached, the Texians took cover in a horseshoe shaped gully which provided an excellent defensive position.  The Texian long rifles proved to be effective military weapons because of their longer range and accuracy.  Reported losses (which are frequently exaggerated) included 14 Mexican killed and 39 wounded.  The Texans claimed only one killed and one wounded.