Plan of the City of Mexico and its Defences, September 13th 1847, upon the Approach of the American Army under Major Genl Scott; received by the Office of the Chief of Engineers on June 29, 1848.
Record Group 77: Records of the Office of the Chief of Engineers
Series: Fortifications Map File Plans of Military Forts
File Unit: Drawer 112
Image description: Map of Mexico City, which at time was pretty much only the Centro Histórico of the city. The map also shows a fair amount of land outside the Centro Histórico which is filled in with illustrations of undeveloped land or crops, as well as lines showing the defenses around the city.
Image description: Zoomed-in portion of the map showing the area from the Alameda Central to the National Palace.
Source: catalog.archives.gov
