August 27th:
According to Wikipedia and other sources, on August 27th:
1832 – Black Hawk, leader of the Sauk tribe of Native Americans, surrenders to U.S. authorities, ending the Black Hawk War.
1859 – Petroleum is discovered in Titusville, Pennsylvania leading to the world's first commercially successful oil well.
1861 – Union forces attack Cape Hatteras, North Carolina.
2003 – Mars makes its closest approach to Earth in nearly 60,000 years, passing 34,646,418 miles (55,758,005 km) distant.