October 1864. The confederate ironclad CSS Albemarle had sunk two federal warships and damaged seven others, taking control of the Roanoke River and threatening the Union blockade. Twenty-one-year-old navy lieutenant William Barker Cushing hatched a daring plan: to attack the fearsome warship with a few dozen men in two small wooden boats. What followed, the close-range torpedoing of the Albemarle and Cushing's harrowing two-day escape downriver from...