During retreat from San Antonio, the Mexican defenders (part of the 1st Line of Defense (or sometimes the "Army of the Center") with Colonel F. Villarreal and about 2,000 men: 700 of the "Hidalgo," 500 of the "Victoria" (Lieutenant Colonel P. Jorrin) National Guards Battalions, and 800 others: under Colonels A. Zerecero and J. G. Perdigón Garay), were struck in flank by Clarke's Brigade. Garland moved forward as the Mexicans withdrew from San Antonio and captured a General and four guns.