Asgard-Jotunheim War

The Asgard-Jotunheim War was a war between the Asgardians and the Frost Giants.  It took centuries for it to end, beginning from 965 AD to 2010,

Battle of Tønsberg
Main article: Battle of Tønsberg

The Battle of Tønsberg was one of the first major battles in the war. The Frost Giants came down to Earth and attempted to conquer the Midgardians (or rather the humans) and begin another ice Age. However, the Asgardians let by Odin drove Laufey's people back to their homeworld.

Battle of Jotunheim
The Battle of Jotunheim was the final battle before the conflict began thousand years later. After the battle of Tønsberg, Odin invaded the planet, Jotunheim and later, Laufey surrendered and a truce between the two races happened.Not only taking the casket, Odin also took an abandoned infant who was Laufey's son.