Cannon from the Battle of Narva

Origin
The Battle of Narva on November 1700 was an early battle in the Great Northern War. A Swedish relief army under Charles XII of Sweden defeated a Russian siege force three to four times its size. During the battle, a blizzard raged and prevented each side from attacking. But midday the winds started to blow into the Russian camps, blinding them and giving the Swedes a chance to attack. Thousands of retreating soldiers perished when a bridge collapsed into the local river and the remaining troops surrendered. All of Russia’s weapons and military supplies were brought to the battle and taken by Sweden. If Swedish forces immediately attacked, Russia would have had almost no way of defending itself.

Effects
The cannon can create a large snowstorm from its breach when fired. Putting in a piece of ice or snow will make the storm stronger and larger. Its winds can randomly change direction and severely limit the field of vision of anyone caught in the snow. Weapons and ammunition become hard to locate and effectively disappear from all in the storm. Also, the snow can crystallize and become an abrasive capable of eroding stone and weakening metal within several hours. This leads to the destruction of many bridges, towers and vehicles within the area.