German submarine U-47 (1938)
…on 17 December 1938 under the command of Günther Prien. During U-47's career, she sank a total of 31 enemy vessels, including the British battleship HMS Royal Oak, and damaged nine more. U-47 was the thirteenth most successful U-boat of World War II based on tonnage of enemy shipping sunk. U-47 disappeared in…