assault was made on the morning of the 20th, and in less than half an hour from the sound of the advance the position was in our hands, with many prisoners and large quantities of ordnance and other stores. The brigade commanded by General Riley was from its position the most conspicuous in the final assault, but all did well, volunteers and regulars.
From the point occupied by Garland′s brigade we could see the progress made at Contreras and the movement of troops toward the flank and rear of the enemy opposing us. The Mexicans all the way back to the city could see the same thing, and their conduct showed plainly that they did not enjoy the sight. We moved out at once, and found them gone from our immediate front. Clarke′s brigade of Worth′s division now moved west over the point of the Pedregal, and after having passed to the north sufficiently to clear San Antonio, turned east and got on the causeway leading to Churubusco and the City of Mexico. When he approached Churubusco his left, under Colonel Hoffman, attacked a tete-de-pont at that place and brought on an engagement. About an hour after, Garland was ordered to advance directly along the causeway, and got up in time to take part in the engagement. San Antonio was found evacuated, the evacuation having probably taken place immediately upon the enemy seeing the stars and stripes waving over Contreras.
