On Sept. 13, 1847, the American army assaulted the Mexican Military Academy, a fortress known as Chapultepec, which guarded the gates to Mexico City. Although the Mexicans inside fought valiantly, they were outgunned and outnumbered and were soon overrun. With Chapultepec under their control, the Americans were able to storm two of the city gates and by nightfall were in tentative control of Mexico City itself. Although the Americans captured Chapultepec, the battle is a source of great pride for Mexicans today, as young cadets fought bravely to defend the fortress.