On 26 September 1860, the U.S. Navy Sloop-of-War Constellation, commanded by J.S. Nicholas, captured the American slaver Cora with 705 slaves on board off the Congo River. The newly freed slaves were taken to Monrovia, Liberia.
Read more about USS Constellation:
http://www.history.navy.mil/danfs/c1...llation-ii.htm --