There is no ship known, it is not the Lusitania, which was an English ship.
a German U-boat.
the lusitania
Lusitania wasn't a German submarine, it was an American merchant ship that was sunk by German submarines.
Clement
sumbmarine warefare
In 1915, the British ocean liner Lusitania was torpedoed by a German u-boat (submarine) and sunk because the central powers believed the ship was being utilized to transport contraband (war materials) to the United Kingdom.
RMS Lusitania (RMS stands for Royal Mail Ship).
The Lusitania was a British ship which was sunk by a German submarine on May 7, 1915
luisitania
You are describing the Graf Spee, but it was not "sunk" in the common use of the word, (that is, by an enemy ship) it was scuttled by her own captain.
It got sunk because the bismark sunk the flag ship of the royal navy,(Hood), the british then sent every war ship available to sink bismark. At 9.00am on the 21st of may, the bismark was sunk by the british ships.