- "Once, mankind accepted a simple truth; that they were not alone in this universe. Some worlds man believed home to their gods. Others, they knew to fear. From around the cold and darkness came the Frost Giants, threatening to plunge the mortal world into a new ice age. But humanity would not face this threat alone."
- ―Odin to Loki and Thor[src]
The Battle of Tønsberg was a fierce and pivotal battle during the Asgard-Jotunheim War that occurred on Earth, in what is present day Tønsberg, Norway, between the Frost Giants led by King Laufey who desired to bring about a new ice age on Earth and the forces of Asgard led by King Odin.
The battle marked a major turning point in the war which would help led to the Frost Giants' ultimate defeat.
The war eventually reached Earth, where the Frost Giants invaded the small Viking village in what is now Tønsberg, Norway. Using the Casket of Ancient Winters, King Laufey murdered hundreds of human villagers, until the Asgardians assembled an army of their best warriors and drove the Frost Giants from Earth.