Chapultepec
2 of the 7 encyclopedias on this shelf carry an entry for Chapultepec. Both are reproduced below, so you can see where they agree and where they differ.
Aiton's Encyclopedia (1910)
cha-pool-te-pec', a rocky eminence about three miles from the city of Mexico. The name is said to be Aztec for "grasshopper hill." It rises about 150 feet above the surface. It was the county seat of the Aztec emperor Montezuma. A cypress grove at the western foot may yet be seen. The rock was fortified by the Spaniards. It was occupied by the Mexicans as a military academy, and was defended by a garrison. At the approach of the war between the United States and Mexico Chapultepec was relied upon to protect the road to the city from that quarter, and was defended pluckily by a garrison. It cost our invading army under General Winfield Scott three days and 863 killed and wounded to invest and take the place. The engagement took place September 12-13, 1847. Among the Americans engaged in planting batteries, pioneering, and scaling were many young soldiers whose names are well known. Some of these are Mayne Reid, George B. McClellan, Robert E. Lee, Stonewall Jackson, Raphael Semmes, Joseph E. Johnston, and James Longstreet.
Collier's New Encyclopedia (1921)
a rocky elevation about 3 miles S. W. of the City of Mexico. From this point at an early day an aqueduct to water was brought in the city, but no buildings were placed on it until about 1785, when the Viceroy of Mexico, Galvez, began the erection of a palace in the form of a fort, or castle, and intended for a stronghold as well as a residence. It was left unfinished until after the revolution. When the republic was formed, part of the building was used for a military school and the National Astronomical Observatory was erected on the hill. During the war with the United States, Gen. Pillow stormed the castle, Sept. 13, 1847. The Emperor Maximilian made Chapultepec his principal palace, and it is now occupied by the president, the portions used by the school and observatory, however, being still reserved for them. There is a beautiful park surrounding the hill, which is a favorite resort for the residents of the city.