The first war we come across is the Disc War. The Disc War was between Dream and TommyInnit. The two discs are Tommy's prized possessions on the server. Dream however wanted to get a hold of them, so he could have complete control over Tommy. They have been going back and forth, using the discs as leverage over one another all until January 21st of 2021 where Tommy and Tubbo fought Dream to the death. Dream ended up losing 2 of his 3 cannon lives that day and was placed in Pandora's Vault, a prison built on the server by Awesamdude. Dream would have lost all three of his cannon lives that day, but the only thing that kept Tommy from taking all of them was the fact that Dream could revive people after they had lost their third cannon life. So, with Wilbur dead and hopes to bring him back to life, they just locked up Dream for later use