[2][3] On August 9, 2021, MLW announced that War Chamber would take place at the NYTEX Sports Centre in North Richland Hills, Texas on September 11.
On the October 13, 2021 episode of Fusion: Alpha, Contra leader Josef Samael challenged Hammerstone to a War Chamber match against himself, Ikuro Kwon, Jacob Fatu, and Mads Krügger.
After vacating the MLW National Openweight Championship, Hammerstone recruited EJ Nduka, and Dynasty stablemate Richard Holliday to his team.
[9] During the War Chamber "Control Center" segment on the October 27 episode, it was announced that Samael had recruited a Sentai Death Squad member, thus making the match 5 on 5.
[13] On September 13, it was announced that Bobby Fish, who had been recently released by WWE, would be making his MLW debut at Fightland as the sixth participant in the Opera Cup.