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.
The troops that had been engaged at Contreras, and even then on their way to that battle-field, were moved by a causeway west of, and parallel to the one by way of San Antonio and Churubusco.

It was expected by the commanding general that these troops would move north sufficiently far to flank the enemy out of his position at Churubusco, before turning east to reach the San Antonio road, but they did not succeed in this, and Churubusco proved to be about the severest battle fought in the valley of Mexico.