September 1847

Monday 06:

Henry David Thoreau leaves Walden Pond and moves in with Ralph Waldo Emerson and his family in Concord, Massachusetts.

Saturday 11:

Stephen Foster's most memorable song, Oh! Susanna, is first performed at a saloon in Pittsburgh, Pennsylvania.

Sunday 12:

Mexican-American War: The Battle of Chapultepec begins. U.S. Army deserters in the Saint Patrick's Battalion who fought alongside the Mexican army are hanged en masse for treason by the order of General Winfield Scott.

Monday 13:

Mexican-American War: Six teenage military cadets known as Niños Héroes die defending Chapultepec Castle in the Battle of Chapultepec. American General Winfield Scott captures Mexico City in the Mexican-American War.

Tuesday 14:

Mexican-American War: Winfield Scott captures Mexico City.