 Anxious to revenge themselves against the Austro-Hungarians, the Royal Italian Navy ("Regia Marina") planned an attack on the two ships in their berths in the Bay of Muggia, near Trieste, by MAS boats.On the night of 9/10 December, two MAS boats managed to penetrate the harbor defenses undetected, and fired torpedoes at "Wien" and "Budapest".The torpedoes fired at the "Budapest" struck the mole of the seaplane station, but "Wien" was hit twice and capsized in five minutes, killing 46 of the crew.