Viborg Bang

Olaus Magnus depicted the Viborg Bang on his Carta Marina.

The Viborg Bang (Swedish: Viborgska Smällen, Finnish: Viipurin pamaus), as it is traditionally called in Swedish historiography, was a possibly legendary explosion which occurred at Viborg Castle in November 1495. It occurred during an assault on the castle by forces of the Grand Duchy of Moscow and is supposed to have had a crushing effect upon the morale of the besiegers, causing the attack to fail.