Battle of the Citadel

"Now, Prophet... your end has come."

- Shipmaster Rtas 'Vadum

The Battle of the Citadel was the final battle off the Human-Covenant War. It was fought between the allied United Nations Space Command, Sangheili, and local Forerunner constructs against the forces of the Covenant loyalists, and against the Flood. It marked the end of both the Human-Covenant War and the Covenant Empire.

Landing
Having secured the Cartographer, the majority of the remaining UNSC and Sangheili converged on a communications citadel that housed the remaining Covenant forces and the High Prophet of Truth. However, the citadel was protected by an energy barrier which had to be shut down from three barrier towers surrounding it. The initial landing forces were transported to the various locations by five Pelicans and two Phantoms. The group split up and two Pelicans, holding Johnson and many Marines, headed to the third tower. The two Phantoms landed at the second tower, dropping Thel 'Vadam and several Elites straight into the fighting. Two of the remaining Pelicans, including Kilo 023, headed towards the first tower, where they met heavy fire, resulting in one of the Pelicans being shot down. Kilo 023 was carrying Spartan-117 and three ODSTs.

Securing the towers
John-117 and the three ODSTs proceeded up the beach, eliminating any Jiralhanae and Unggoy resistance, until they came to an Anti-Aircraft Wraith and a pack of Jiralhanae, lead by a War Chieftain. John eliminated the Jiralhanae and neutralized the Anti-Aircraft Wraith. Commander Keyes then dropped off a Warthog, a Mongoose and several more Marines. Meanwhile, Shipmaster Rtas 'Vadum created a diversion for Truth's forces by bombarding the barrier with the Shadow of Intent's weapons.

John then proceeded to drive inland to the tower and destroyed a Wraith, a Shade, several Ghosts and Prowlers guarding the outside of the building. Commander Keyes once again aided the Master Chief's progress by dropping several weapons. John then destroyed another Shade and cleared out the rest of the enemy resistance outside the tower. The Chief and the remaining Marines battled their way to an elevator that would carry the Chief up to the shield switch, which was guarded by several Brute Minors, two Brute Bodyguards and another Chieftain. He quickly dispatched the Brutes and deactivated the shield, just as Thel 'Vadam did the same at tower two. When Johnson’s team failed to deactivate the barrier, the Commander ordered the Chief and the Arbiter to get to the third tower.

En route to the third tower
Having made his way downstairs and outside, John then proceeded back to the beach. At the beach, the Chief was ordered to take a Hornet to give support to two Phantoms and a Pelican to get to the third tower. On the way, John destroyed an AA Wraith and many Banshees. In front of the Third Tower, the Chief used his Hornet to destroy a Covenant Phantom. Before clearing an LZ for the Commander, John had to destroy two AA Wraiths, two Shade Turrets and several Banshees. He then used the Hornet to kill the Brutes remaining outside of the tower. The Arbiter then dropped down to help John.

Securing the third tower
John, Thel 'Vadam and seven Elites stormed the tower and met with a Mgalekgolo pair and a large swarm of Yanme'e. The group suffered several casualties and continued on after removing the resistance. They continued until they came to another elevator. John preceded up alone and fought several Brute Stalkers and yet another War Chieftain. John killed these Brutes and deactivated the barrier. At that moment, the Flood infested High Charity crashed into the Ark. Before crashing, High Charity sent out chunks of a Flood infested ship to spread the infection. One of these chunks hit the Separatist ship Shadow of Intent and caused "significant damage", rendering it useless for the rest of the battle. John fought his way though the Flood to reach the Arbiter and together they fought the Flood back and reached the rally point where the Marines were gathering. There they had a Scorpion Tank, an M12G1 LAAV Warthog and a Mongoose. The Marines and the surviving Elites then drove through the cave and onto the Citadel.

The Citadel
The group moved through a valley and along the cliffs, fighting the remaining Brutes, Ghosts, Prowlers and Wraiths. Having dealt with the resistance, John got into a Hornet as two Scarabs dropped from orbit and the last battle of the Human-Covenant War commenced. The UNSC and Sangheili used several Hornets, Pelicans, a Scorpion Tank and several Warthogs to fight the Scarabs and the oncoming waves of Banshees, Ghosts and Prowlers. John had soon destroyed one of the Scarabs, allowing the UNSC to concentrate their firepower on the last Scarab. When that was destroyed, the Marines were ordered to get rid of the survivors while The Arbiter and John went to deal with Truth.

Finishing the Fight
En route to the top of the Citadel, Truth intercepted his broadcast to his faithful populace. It showed and disclosed Johnson being held captive by a Brute Bodyguard. When Commander Keyes asked how close John was, he replied that he wasn’t close enough to reach the captive Sergeant. Meanwhile, Johnson was antagonizing a Brute Chieftain in an attempt to kill him so that Truth couldn't activate the rings (as he needed a human to do it). In an attempt to rescue Johnson, Commander Keyes used a Pelican to crash through the window, killing two Brutes before getting killed when Truth shot her seven times in the back with a Spiker. Truth, with the help of a now disheartened and demoralized Johnson, activates the remaining Installations. When the elevator reached the top, and John and the Arbiter got off, two tank forms offered their assistance to switch off the Installations and stop a galaxy-wide genocide. John, the Arbiter and the Flood battled their way through the remnants of the Covenant and despite strong resistance from the latter, they reached the platform where they found Johnson with the dead body of Miranda Keyes. Thel 'Vadam then executed Truth while John deactivated the Installations. With their goal achieved and the war over, the Flood turned on them. John and the Arbiter were forced to double-back and find another way out. Fighting through the hordes of Flood, they dropped down a chute, and discovered that the Ark was building a replacement for the lost Alpha Halo.

List of appearances

 * Halo 3
 * Halo: Hunters in the Dark
 * Halo Mythos