Battle of Tønsberg

The Asgardian War is one of many names given to an ancient conflict fought centuries ago by the Asgardians and the Frost Giants of Jotunheim. Taking place in 965 AD, the war began when Laufey, the king of the Frost Giants, violated a peace agreement with Odin and attempted to conquer the Nine Realms, starting with Earth. The battle made its way to a large Viking settlement in Norway, where the Asgardians protected the humans, who subsequently worshiped the Asgardians as deities. The Asgardians soon forced the Frost Giants back to Jotunheim, where the Frost Giants were defeated and deprived of their ultimate weapon, the Casket of Ancient Winters. Also, after the battle, Odin adopted Laufey's abandoned son Loki, who would later cause great tumult throughout the Nine Realms.

Beginning
The king of the Frost Giants, Laufey, violated a sacred peace agreement enacted many centuries ago by Odin, leading his people on a grand conquest of the Nine Realms. The first target was Earth, where the Frost Giants invaded Tønsberg, Norway. Using the Casket of Ancient Winters, Laufey murdered hundreds of human villagers, until the Asgardians assembled an army of their best warriors and drove the Frost Giants from Earth.

Final Battle
The Frost Giants returned to Jotunheim, supposedly to replenish their forces, but Odin led a huge force of Asgardian warriors against them. After a long, difficult battle, where Odin personally defeated Laufey while suffering the loss of his right eye, the Asgardians defeated the Jotuns. Odin then granted the Frost Giants mercy and offered a truce between the races, a truce that Laufey was forced to agree to. In the process, Odin confiscated the Casket of Ancient Winters, and as he left Jotunheim, he discovered a baby Jotun who had been abandoned in the conflict by his own father, Laufey. He adopted the baby, and named him Loki.