The most famous surface action the Saint Stephen seen when it got sunked by two torpedo hits under the surface.
Towards the end of WWI, Rear-Admiral Horthy planned another break through the blockade at Otranto. He used all the available units anchoring on the Adriatic for his "Korfu plan". The cruisers should have had sneak close to the Entente ships, shell em, then scurry back, drawing the enemy to the front of the guns of the tactically placed battleships to hammer them.
It was a good plan as far as we can tell, and the fleet set sail on 1918 June 8th and 9th. However on June 10th a small Italian MAS flotilla, led by Captain Luigi "The Sinker" Rizzo, discovered them, and one slipped through the screening ships, targeting the Saint Stephen and by launching two torpedos from 300 meters, she sent our proud battleship to a rendezvous with Neptune. With the ship 4 officers and 85 from the crew found rest in the watery grave.
Since the whole operation depended on surprise, Horthy called it off and all the units returned to port.

picrel
#1 the sinking Saint Stephen
#2 an Italian MAS
#3 the wreck


Well, that's it.
Happy Birthday, Hungary.