Sep 22, 1943
Two British X-craft midget submarines (out of the six which started the mission) penetrated Altenfjord in Norway and attached eight tons of explosives under the German battleship Tirpitz, causing crippling damage. Structural repairs would have to be completed in Germany if Tirpitz could ever operate in open sea again, and Hitler and Donitz decided to keep it in Norway as a floating battery.
Theater: Atlantic Theater
Source: World War II Almanac (1931-1945)