Several months later, the UNSC, Covenant Separatists, and the Covenant Loyalists traveled through a slipspace portal. In the ensuing battle, the UNSC and Separatists cornered the Prophet of Truth at the Citadel. After the reveal of Installation 04B, John and Thel 'Vadam flew to and activated the new installation. Installation 04B detonated right above the Central Hub and destroyed itself.
The UNSC Spirit of Fire arrived at Installation 00 in 2559 and began operations against The Banished. As this struggle continued, the forces of the Spirit eventually took control and defended a Particle Cannon at the border of the South Spire and the Central Hub.