lery, Lieutenant Colonel Belton, and the 4th infantry, Major Lee, with the battery under Lieutenant Colonel Duncan, moved slowly along the causeway to an angle which partially masked them from the enemy's fire, and, at the same time, Colonel Clarke made a détour to the left, with the second brigade, and the light battalion, under Lieutenant Colonel Smith, through thickets of I Chaparral, and across the wide bed of lava, to envelope the right of the position, and cut off the retreat of the enemy. Before the movement could be completed, the garrison at San Antonio, alarmed at the capture of the intrenched camp of Contreras, commenced evacuating the works. Guided by Captain Mason, of the engineers, Colonel Clarke performed his weary march, of more than two miles, in a very short time; but, on approaching the causeway, twelve hundred yards in rear of San Antonio, the enemy were discovered in full retreat towards Churubusco. Preceded by two companies of the 5th infantry, under Lieutenant Colonel Scott, the brigade advanced upon the road and cut the Mexican column in two — one portion continuing their retreat upon Churubusco, and the other filing off to the hamlet of Dolores, between the causeway and Lake Xochimilco. As soon as Colonel Clarke opened his fire, Colonel Garland advanced rapidly in column upon San Antonio. The enemy had withdrawn most of their guns. Five pieces, however, which they had abandoned, large stores of public property, and a number of prisoners, among whom was one general, were captured.
Six hundred yards in advance of San Antonio, General Worth reunited his division, and pressed forward with alacrity upon the strong fortifications at Churubusco. Santa Anna had now concentrated his forces,
