1526: Battle of Mohács: In a decisive battle the Hungarian Empire is conquered by the Ottoman Empire led by Suleiman the Magnificent

1825: Portugal recognizes the Independence of Brazil

1842: Great Britain and China sign Treaty of Nanking, ending the Opium war

1862: Second Battle of Bull Run, fought in Manassas, Virginia begins, Confederate victory (US Civil War)

1949: USSR performs its first nuclear test at Semipalatinsk, Kazakh SSR

2005:  Hurricane Katrina makes 2nd and 3rd landfall as a category 3 hurricane, devastating much of the U.S. Gulf Coast from Louisiana to Florida Panhandle. Kills more than 1,836, causes over $115 billion in damage.

Source: Onthisday.com