On May 23, 1941, the Battleship Bismarck was on a roll. The largest and most powerful ship in the German Navy, the mighty Bismarck had broken out into the Atlantic Ocean, sunk a Royal Navy battlecruiser, badly damaged a battleship and was poised to add its guns to a naval blockade that threatened to strangle Great Britain. Ninety-six hours later, heavily damaged, the battleship was on the bottom of the North Atlantic. Bismarck’s swift reversal of fortune was the result of a heroic effort by the Royal Navy to hunt down and destroy the battlewagon, and avenge the more than 1,400 Royal Navy personnel killed in the Denmark Strait.