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Lightmass Offensive

Battle of the Slab



A.E 14[1]


Jacinto Maximum Security Prison





Unknown amount of Drones



The Battle of the Slab was a COG military operation in which Locust were cleared from the Jacinto Maximum Security Prison. Dominic Santiago took that opportunity to break Marcus out of prison,[2] something that Dom had been planning for four years since his trial.


Dom trying to free FenixEdit

Dom tried every resource he could—legal and illegal—to free Marcus from prison. He tried to gain support from government ministers and officers, even selling his Embry Star to a man that would try to break Marcus out of the Slab.[3]

Locust Attack and pardoning of the prisonersEdit

Four years after Marcus Fenix was sent to the Slab, baby Corpsers were discovered coming out of the toliets and the Siege of the Slab started with Fenix leading the prisoners and guards in fighting the Locust, as he was the only one with any experience fighting them. After fighting baby Corpsers and Wretches, Fenix had the survivors lock themselves down in A-Wing while he and a prisoner named Reeve searched for the Locust point of ingress. After discovering an old elevator shaft in the basement and being surrounded by Drones, Reeve locked Marcus in a cell for protection and, as he didn't want to do the same to himself, tried to climb out of the shaft to an unknown fate. Discovering the prison to be overrun, Hoffman sent a platoon to evacuate the prisoners and guards, but they were unable to find Marcus. Unwilling to risk the lives of so many men in a search for one man, Hoffman reluctantly orders Marcus to be left behind.

Dom finds outEdit

After Dom learns from Chairman Prescott of Hoffman abandoning Marcus, he demands answers. After Hoffman still refuses to go in and save Marcus, Dom decides to go himself. Hoffman, unable to help Marcus but unwilling to stop Dom, discreetly tells him to take extra armor and another Lancer for Marcus and turns a blind eye to the fact that he takes JACK with him.

Order of BattleEdit

COG insertionEdit

Two King Ravens, carrying Delta-One and Victor squad, attacked the sector while Dom entered the prison and saved Marcus before two Wretches could attack him, giving him a new suit of armor and a Hammerburst. The two escaped from the cellblock and were almost killed by a missile from KR Six-Four. Dom gave Marcus the option of either taking the guards quarters or the prison blocks and entered combat with the Locust.

Canon Alert!
There are conflicting canon sources for this article:
The player has two options to choose from, the first paragraph is for the prison blocks and the second paragraph is for the guards quarters..

Marcus chose to go to the prison blocks and ran into several Drones attacking them from in front of them and the guard towers. KR Six-Four was able to destroy the guard tower and Marcus and Dom entered the main prison building.

Marcus decided that he still needed readjusting with his armor and chose the guards quarters. While in the quarters, Marcus noticed Victor Squad in a King Raven and Marcus noted that they would need more Ravens for battling the Locust. Dom and Marcus soon took the guard tower from the Drones and ran into the main building while the King Ravens destroyed the outer walls and other towers.

Inside the main building, Dom and Marcus killed several Drones and set up a defensive position from the Drones that was about to breach the building. Using Bolo Grenades, the Drones wounded Dom and Marcus had to kill the invading Drones and save Dom's life before exiting the building. While outside, KR Six-One and KR Six-Four tried to wipe out the Drones in the courtyard but was forced to abort the mission and evacuate Delta-Two from the prison after Six-One was shot down. Six-Four was able to pick up Marcus and Dom before a Corpser emerged from the ground. The COG failed in their mission to defend the area but Dom was able to save his best friend and duo would join Delta-One in taking part in the Lightmass Offensive.


  1. 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 Gears of War: Act 1: Ashes: 14 Years After E-Day
  2. Gears of War: Aspho Fields
  3. Gears of War: Aspho Fields pg. 261

Locust War
0 A.E. Emergence Day (First Battle of Jannermont · Battle of Porta Ogari · Battle of Mattino Junction · Battle of Nordesca · Evacuation of Mercy · Battle of Ephyra (E-Day) · Fall of Gorasnaya ) · Battle of Kinnerlake · Destruction of Halvo Bay · Battle of Autrin · Battle of Jasper · Battle of Kaia
1 A.E. Battle of Bonbourg · Second battle of Jannermont · Fall of Ostri · Battle of Andius · Ambush on Voslov Bridge · Hammer of Dawn strikes · Battle of Oblivion · Skirmish in the Live Zone
5 A.E. Fall of Landown
9 A.E. Battle of Noroa · Riverside Skirmish ·Evacuation of Ilima
10 A.E. Battle of Estana · Skirmish at Shenko Falls · Battle of Ephyra
11 A.E. Skirmish outside the Wire
12 A.E. Raid on Ginnet Drive · Incursions at Endeavor
13 A.E. Battle on the Andius Highway · West Barricade Campaign · Raid on the CIC
14 A.E. Operation: Midnight · Siege of the Slab · Battle of the Slab · Lightmass Offensive · Assault on Franklin's Outpost · Battle of Tollen Dam · Evacuation of Fort Reval · Evacuation of Speyer · Jilane Massacre · Ambush at Sovereigns Boulevard · Evacuation of North Gate · Sinking of Tollen and Montevado · Mission to Tollen · Battle outside of Jacinto · Mission to the Pirnah Badlands · Battle for Fucked · Mission to Montevado · Battle near Jacinto · Unidentified M.O.U.T. battle · Liberation of Jilane · Siege of Jacinto (Raid on Pomeroy Depot · Raid on Jacinto Med) · Operation: Hollow Storm (Assault on Landown · Battle of Ilima · Mission to New Hope Research Facility · Siege of Nexus) · First Mission to Merrenat Naval Base · Skirmish south of Port Farrall · Second Mission to Merrenat Naval Base
15 A.E. Battle of Port Farrall · Ambush outside of Port Farrall · Lambent Pandemic
16 A.E. Skirmish in the Kashkur Foothills
17 A.E. First Battle of Azura · Mission to Hanover · Battle of Centennial Bridge · Battle of the Deadlands · Battle of Anvil Gate · Mission to Mercy · Attack on Griffin Tower · Battle of Endeavor Naval Shipyard · Mission to Halvo Bay · Second Battle of Azura

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