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The Mexican–American War, 1846–1848

Battle of Chapultapec
U.S. forces began their assault on Chapultapec, the main fort protecting Mexico City, on September 12, 1847, with an artillery barrage.
A painting depicting the Battle of Chapultapec.
Source
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"Battle of Chapultepec."
http://en.wikipedia.org/wiki/File:Battle_of_Chapultepec.jpg
Wikipedia
Public domain.