Santiago, Chile, is attacked by indigenous warriors, led by Michimalonco, to free eight indigenous chiefs held captive by the Spaniards.

Santiago, also known as Santiago de Chile, is the capital and largest city of Chile and one of the largest cities in the Americas. It is located in the country's central valley and is the center of the Santiago Metropolitan Region, which has a population of seven million, representing 40% of Chile's total population. Most of the city is situated between 500–650 m (1,640–2,133 ft) above sea level.

Michima Lonco was a Mapuche chief who ruled as an independent sovereign over the territory of the Aconcagua, Mapocho and Maipo valleys. He freed the Picunche from Inca rule and he put up tenacious resistance to the conquest of their territories by the Spanish Empire. He presented himself to the Spaniards, naked and covered by a black pigmentation.

September 11 is the 254th day of the year in the Gregorian calendar; 111 days remain until the end of the year.