Battles of the War: Entrance into the City of Mexico | US-Mexican War
War (1846-1848). Battles of the War: Entrance into the City of Mexico. The final blow to General Antonio Lopez de Santa Anna?s defense of Mexico City came on September 13 and 14. U.S. forces followed up the victory at Chapultepec by pursuing the retreating Mexican forces to the west-side gates of the city.