The document summarizes three important dates in Mexican history: September 13th commemorates "Día de los niños Héroes" and the Battle of Chapultepec where six young soldiers died defending Castillo de Chapultepec from the United States; September 16th marks "Día de la Independencia" and the start of Mexico's war for independence led by Father Miguel Hidalgo in 1810; November 20th is "Revolución Mexicana" day which began the revolution against President Porfirio Díaz who had been in power for over 30 years.