WWF television since Survivor Series. Earlier in the night, Helmsley (now primarily wrestling under the ring name of Triple H) defeated Sgt. Slaughter with the help of Chyna in a Boot Camp match. On the December 22 episode of Raw is War however, Michaels and Triple H were forced by Slaughter to wrestle each other for the European Championship. In a mock match, Michaels laid down in the middle of the ring while Triple H constantly ran the ropes. Triple H would then pin Michaels and win the European Championship. In the beginning of 1998, Triple H exchanged the European Championship with Owen Hart. Going into WrestleMania XIV that March, Shawn Michaels was the reigning WWF Champion and Triple H was the reigning WWF European Champion. Heavyweight boxer Mike Tyson was also involved as the "special enforcer" in the main event of the night featuring Michaels against Stone Cold Steve Austin. In the weeks leading up to the event, Tyson was revealed to have joined D-Generation X and looked as if he was going to help Michaels retain the championship. However, at the end of the match, Tyson turned on DX and cost Michaels the match and the WWF Championship, allowing Austin to win the title. Michaels' Departure and Group Expansion (1998–1999) The night after WrestleMania, Triple H officially ejected Michaels from DX for "dropping the ball" over the Tyson incident and subsequently losing the WWF Championship. In reality, Michaels had suffered a severe back injury during his Casket Match with The Undertaker at the Royal Rumble, and started what would become a four-year hiatus from wrestling to recuperate. Triple H would assume full leadership of DX and recruited X-Pac, who had been recently fired from WCW, and the current WWF Tag Team Champions The New Age Outlaws ("Bad Ass" Billy Gunn and "The Road Dogg" Jesse James) into the stable. While the intent was for the stable to remain heels, they quickly became popular with audiences and were eventually pushed as faces. During this time, they feuded with The Rock and his group the Nation of Domination and then later, Vince McMahon's Corporation. The group remained united and hugely popular throughout 1998 and into early 1999. On episodes of Raw Is War in April and May DX "went to war" with WCW, with whom the WWF were in direct competition at the time, through a series of legitimate visits