Attack on Jotunheim

"At least make it a challenge for me!"

- Thor

The Skirmish in Jotunheim was an attempted attack on Jotunheim led by Thor after some Frost Giants managed to enter Odin's Vault and attempted to steal the Casket of Ancient Winters.

Background
"I think you’re right. About the Frost Giants, about Laufey, about everything. If they found a way to penetrate Asgard’s defenses once, who’s to say they won’t try again. Next time with an army."

- Loki

Back in 900 B.C, the Asgardians, during the Asgard-Jotunheim War battled the Frost Giants on Jotunheim and ultimately won the fight. Odin made a truce with Laufey, leader of the Frost Giants and confiscated the Casket of Ancient Winters. He also took an abandoned baby and adopted him, naming him Loki.

During Thor's - Odin's biological son - coronation, the truce was seemingly broken when the Frost Giants entered Odin's Vault and stole the Casket of Ancient Winters, but not before the Destroyer interfered and thwarted the theft. Thor, enraged then swore revenge on Jotunheim and gathered Loki, the Warriors Three and Lady Sif to accompany him on the journey to Jotunheim.

Attack
To be Added

Aftermath
After Odin came to rescue Thor, Loki, the Warriors Three and Lady Sif, Odin - enraged that Thor had selfishly attacked Jotunheim, sparking a war that Asgard is forced into and as a result, stripped him of his powers and banished him and Mjølnir to Earth.

Loki later revealed that he had informed a guard of their journey to Jotunheim, who in turn told Odin. Soon after Loki realized that he wasn't Asgardian, but biologically a Frost Giant, Loki raged as Odin fell into the Odinsleep.