Video: 'Ken.Burns.The.Civil.War.9of9.The.Better.Angels.Of.Our.Nature' (Apr. 27, 1865 at 9:56)

(Thursday, April 27, 1865, 2:00 a.m. local time; during the American Civil War) — SS Sultana, a Mississippi River side-wheel steamboat exploded this morning in the greatest maritime disaster in United States history.

An estimated 1,800 of her 2,427 passengers, including 2,1000 recently liberated Union prisoners of war, died when three of the boat’s four boilers exploded and she burned to the waterline and sank near Memphis.