This is a response to the DWLs who are coming here who say that something like this could never happen in Norway. Apparently, they aren’t familiar with this story … the “content of the character” of the Germanic peoples has changed over the centuries. It has changed radically just since WW2.
Berserkers (or berserks) were Norse warriors who are reported in the Old Norse literature to have fought in a nearly uncontrollable, trance-like fury, a characteristic which later gave rise to the English word berserk. Berserkers are attested in numerous Old Norse sources. Most historians believe that berserkers worked themselves into a rage before battle, but some think that they might have consumed drugged foods.
The term “vandalism” is an archaic tribute to the Vandals. The English language is full of all sorts of interesting stories.