Scotland

Here is one of history's tiny little stories. HMS Hawke was sunk by SMS U-9 commanded by Otto Weddingen, who had just previously sunk three warships (albeit old ones) in a single encounter, submerged all the while. This convinced a lot of people that submarines were not toys, but actual threats. Weddingen went on to command U-29 which was the only ship ever sunk by HMS Dreadnought, the first dreadnoughts type battleship that started the big naval arms race in Europe (and Dreadnought sunk the U-boat by ramming, not gunfire).