|Previous battle: クリーブランド攻防|
|Concurrent battle: 地球攻防戦|
|Next battle: アーク攻防|
|Place: 太陽系 惑星地球 ケニヤ|
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- "Marines, the Prophet of Truth doesn't know it yet, but he's about to get kicked right off his throne. You will take our city back. And drive our enemy into the grave they've been so happily digging. One final effort is all that remains."
- —Fleet Admiral Terrence Hood
In the morning, the Spartan was recovered by Marines led by Sergeant Johnson, and the Arbiter with them. Just as they thought they'd need to call in VTOL support to carry the Spartan's body away, he woke up. As John-117 got to his feet, Johnson sent the First Squad forward as the scouts. The Bravo Team, led by GySgt Reynolds, was scouting the jungle some kilometers away, and Johnson radioed Reynolds to fall back to the extraction point at the Nkuu River located nearby. Soon, a Covenant Phantom appeared overhead, and Johnson decided to split the squads, in order to go undetected. With the Second Squad, he would find another way to the extraction point while the First Squad and GySgt Stacker went with the Chief and the Arbiter and headed straight to the river.
After some time, John-117 and the Arbiter discovered Reynolds. He was being tortured by a Jiralhanae, who tried to force him to tell the location of the UNSC base in the area. After being saved, Reynolds told the Chief and the Arbiter that a Jiralhanae Chieftain on a Phantom had pinned them down and killed his entire squad. Reynolds then joined Arbiter and John on their way to the river. As the Arbiter and John-117 arrived at the river, Johnson and the Second Squad were already picked up by a Pelican, Echo 51, with another Pelican hovering nearby and providing fire support against the numerous Covenant ground troops around the river. Suddenly, two Banshees appeared and shot down the Pelicans. Echo 51, its thruster heavily damaged, crashed about half a kilometer away, while the other one plunged straight to the water.
Arbiter and the Chief then made their way to the crash site, where Johnson and his Marines were holding position. However, they were too late. Johnson and his squad were captured by the Jiralhanae and taken to GWC's A2 Hydroelectric Facility nearby. SPARTAN-117 and the Arbiter made their way to the dam, where Johnson and his Marines were being held. After defeating the Covenant on the dam, including the Jiralhanae Chieftain in command of the Covenant forces in the area, the human prisoners were freed. After this however, two more Phantoms appeared, dropping off Covenant reinforcements on the dam. The UNSC forces held off the attacking Covenant for some time, and not long after, the Pelican Kilo 23 arrived, destroying the Phantoms. The Marines, John-117 and the Arbiter boarded the dropship, and set course for the UNSC base, Crow's Nest.
Shortly after John-117 was recovered, the Arbiter, and Sergeant Major Avery J. Johnson arrived at the base and began to discuss plans for attacking the Prophet of Truth's army at the Forerunner structure, the Prophet sent a transmission announcing his plans to destroy them and launched a massive assault on the Marine base. The UNSC forces, spread thin, fought against the Covenant forces in order to hold them back long enough to evacuate the wounded.
The Chief, alongside with squads led by Gunnery Sergeants Reynolds and Pete Stacker, led a strike against the bulk of the invaders while Johnson and the Arbiter guarded the ops center. The Chief soon had to return to the ops center, as the Jiralhanae were attacking it. He swiftly defeated the invasion and learned that Keyes had ordered the massive bomb planted, which would explode and set off other charges in the base, obliterating it and all Covenant within. The Chief then had to go with the Arbiter to rescue Marines trapped by the Jiralhanae in the barracks before the Jiralhanae killed all the prisoners.
The Chief and the Arbiter rescued as many Marines as they could and had Hocus evacuate them (and the rest of the UNSC forces still there) via Pelican. The Chief and the Arbiter then fell back to the ops center to defeat a Jiralhanae force that took it over and turned off the bomb. They reset the bomb and retreated, barely escaping as the bomb went off and killed the remaining Covenant.
UNSC forces led by John-117 and Gunnery Sergeant Reynolds, a small amount of Marines who survived the battle of Crow's Nest unscathed, escaped the ruins of the complex in Warthogs to avoid Jiralhanae who would inevitably search the remains of the base for survivors. While escaping, they helped a group of Marines near the base's entrance who were pinned down by Covenant scouts. The survivors were unable to send transmissions, but they were able to receive them. They were ordered by Miranda Keyes to go to Voi and assist Marine forces there, who were battling the Prophet of Truth's troops.
John-117 and the Marines traveled along the Tsavo Highway, battling Covenant troops in the shadow of the skeletal remains of the New Mombasa Orbital Elevator. Nearby, Gunnery Sergeant Pete Stacker led a convoy bringing supplies to the exhausted troops at Voi, but they were ambushed and strafed by Banshees. John-117 and the Marines with him were able to reach the convoy and rescue the survivors. They were finally able to communicate with Miranda Keyes, who was told by ONI Recon 111 that the Prophet of Truth was excavating the Ark. With the help of resupply Pelicans sent by Sergeant Major Avery Junior Johnson, John-117's convoy was able to punch through to Voi.
After his battle to fight his way up the Tsavo Highway, John-117 not only secured the gate to Voi but also a landing zone for Commander Miranda Keyes to deploy her Marines. Mounting up with a group of Warthogs, he rode shotgun through the gates to the outside of the Traxus facility where previous Marine counter attacks had failed. Ten marines dismounted from the Transport Warthogs along with the Chief and then a few remained to operate their Warthog LRV to give them heavy support. The Traxus facility composed of several areas, each sealed off by a bulk head to allow and deny movement between the areas. After initially infiltrating the facility the first gate was opened, interrupting a File of Kig-yar and Unggoy during one of Truth's speeches. They were taken by surprise and quickly gunned down. After quickly hammering through another file of grunts Chief opened the door to a long tunnel heading down the facility. A large group of Unggoy, Kig-yar and a single Jiralhanae Captain guarded the other end of the corridor, along with their reserve Ghost RAVs. After the combined arms of the Chief, the Warthog and the Marines defeated the defenders, they finally broke through to their first objective.
Inside, the UNSC Forces still held parts of the facility but were being pushed back by an assault being headed by a Jiralhanae Chieftain. In there a Marine fire team operating a AIE-486H Heavy Machine Gun held the Covenant at bay, at least for a time. A Marine squad headed by Spartan-117 pushed in and killed the Jiralhanae Chieftain and his bodyguards attempting to oust the Marine defenders. After opening the next bulkhead for the Warthog supporting them they were ambushed by a swarm of Yanme'e that descended from a Phantom overhead. After forcing them into a retreat the Master Chief and the Warthog linked up with a Marine Anti Tank unit armed with M41 SSR MAV/AW that had requisitioned four M274 Mongoose ULATV to use as improvised fast attack light anti armor vehicles. A Marine offered Spartan-117 the controls of his Mongoose and he led them out into the next Dock.
In the next dry dock a pair of AA Wraiths battered UNSC air forces, but only because this time they had a significant amount of defensive measures compared to the last area. A number of Ghosts and Chopper RAVs defended them against UNSC counter attack. The Marine mounted Anti Tank unit, the supporting Warthog LRV and a number of troops defending the actual dock with conventional arms and a series of SAM Turrets. Covenant forces were beaten back and their AA batteries destroyed but they refused to admit defeat, bringing in Ghost reinforcements on Phantoms. They were all defeated in turn, leaving the UNSC forces a quick breather and a chance to bring in more mounted Anti Tank units before the Covenant gave one last push to retake the dock. A Type-47 Ultra Heavy Assault Platform, better known as the Scarab, crawled over the roof tops and engaged the mounted forces in the dock. The Marines had a choice whether to disable its legs to cripple it and bring it low then board and destroy its power core or to buy time for the Master Chief so he could use one of the Dock Cranes to board it. In time, it was defeated and destroyed, giving the UNSC forces breathing space to make their push for the final objective.
John-117 soon traveled up to the dock and was joined by another squad of reinforcements led by Thel 'Vadam and moved through to another section of the Traxus facility, another section held by the Marines. It served as their local command center, their medical station and their ammo dump. It was heavily fortified with numerous defensive points armed with machine guns, but at the other end of the base, where it entered the warehouse, their defensive position was falling. Jiralhanae forces had pushed back through the warehouse, flanking their defensive position. UNSC Forces, now joined by Voi dock and factory workers and led by the Arbiter and the Chief soon pushed back, retaking the warehouse and defeating large groups of Jiralhanae and even a Mgalekgolo pair before a showdown with a Chieftain outside. After more tight street to street fighting, they pushed the Covenant forces back to the rocky precipice where the AA gun lay. With no way for the Jiralhanae to retreat and with Lord Hood's attack imminent, it was make or break time. UNSC forces pushed up the hill, fighting off another War Chieftain, numerous Unggoy and Kig-yar, the Chieftain's pack and several hastily planted Plasma Cannons. After defeating the forces guarding it they destroyed its rapidly overheating core and cooling system to cripple it and waited as Lord Hood's attack commenced.
UNSC強襲部隊はフリゲート艦(UNSC Forward Unto Dawn等3隻)とロングソード戦闘機部隊をもってドレッドノート に空襲を敢行する。艦隊はMACガンを複数発発射し、航空機部隊は激しい空襲を実施した。全弾直撃したにも拘らず船は無傷であった。強襲するために接近したUNSC艦隊とは逆にコヴナントはポータル周辺から退避を始めていた。やがて遺跡が起動し衝撃波を受けて艦隊と航空隊が沈黙し、遺跡が完全に役目を終えた時、コヴナント艦隊とドレッドノートは地球からポータルに姿を消す。それとほぼ同時刻に、損傷したCCS-class battlecruiser が1隻ボイ上空に現れ、街に墜落した。新たなジラネルハイの増援かと思われた。しかし、それに乗っていたのはフラッドの大群であった。
街を取り戻したUNSCであったが、突然街のあちこちからわいて出てきたフラッドによって瞬く間に混乱に陥った。とうとう地球にまで被害が拡大したのだ。キース中佐はこの事態を打開するためには墜落した巡洋艦を爆破し街を破壊するしかないと提言した。街に再び戻ったアービターとチーフは既にフラッドにやられた兵士たちと敵(コンバットフォームとインフェクションフォーム)に包囲されつつある海兵隊と遭遇する。生存者たちは元々仲間であったそれに銃口を向けねばならなかった。 彼らは街に設営された臨時のコマンドセンターへ戻ろうとしたが、道は封鎖され、フラッドの大群であふれかえっていた。融合コイルやM7057 Defoliant Projectorを対フラッド用の武器として活用し、どうにか臨時指揮所に戻った。しかし、そこには一人の生存者しか居なかった。UNSC軍は被害を抑えるために墜落した船に対する突入を継続したが、そこに新たな同盟軍が上空から遣ってくるのであった。