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


Dom trying to free FenixEdit

Dom tried every resource that he could, legal and illegal to free Marcus from prison. He tried to gain support from the 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, the baby Corpsers are discovered coming out of the toilets 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 the baby Corpsers and Wretches, Fenix had the survivors lock themselves down in the 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 the Drones, Reeve locked Marcus in a cell for protection and as he did not 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 are unable to find Marcus. Unwilling to risk the lives of so many men in a search for one man, Hoffman reluctantly ordered Marcus to be left behind.

Dom found outEdit

After Dom learned from Chairman Prescott about Hoffman abandoning Marcus, he demanded answers. After Hoffman still refused to go in and save Marcus, Dom decided to go himself. Hoffman, unable to help Marcus, but unwilling to stop Dom discreetly told him to take extra armor and another Lancer for Marcus and turned a blind eye to the fact that he took JACK with him.

Order of BattleEdit

COG insertionEdit

The two King Ravens, carrying Delta-One and Victor squad attacked the sector while Dom entered the prison and saved Marcus before the two Wretches could attack him, giving him a new suit of armor and a Hammerburst. The two escaped from the cellblock and are 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 setted a defensive position up 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 the Drones out 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 Marcus and Dom up 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 Mattino Junction · First Battle of Ilima · Battle of Porta Ogari · First Battle of Ephyra · Fall of Gorasnaya · Evacuation of Mercy) · Battle of Nordesca · Battle of Kinnerlake · Destruction of Halvo Bay (Destruction of Old Town · Battle of the Museum of Military Glory · Siege of Halvo Bay Military Academy · Evacuation of Seahorse Hills · Battle of Elliott's Mansion · Raid on Onyx Point · Destruction of Downtown Halvo Bay · Ambush on the Halvo Bay Courthouse · Battle of the Plaza) · Battle of Kaia (Battle of Jasper · Battle of Autrin)
1 A.E. Battle of Bonbourg · Second Battle of Jannermont · Fall of Ostri · Battle of Andius · Ambush on Voslov Bridge · Hammer of Dawn Strikes · Fall of Claybourne · Siege of Zenic Laboratory · Assassination of Ukkon (Mission to CIC Aldair · Rescue of Echo-Five · Assault on Industrial District · Mission to Claybourne · Rescue of Alpha-Two · Mission to Nedroma Health Institute · Battle of Imtik Imulsion Rig · Mission to Winlock Outpost · Mission to the Badlands · Mission to Zenic Province · Battle of Ukkon's Laboratory) · 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 (Ambush on Checkpoint Zeta · Assault on Ilima Savings and Trust · Mission to Ilima High School · Battle of Downtown Ilima · Battle of Dr. Wisen's Orphanage)
10 A.E. Battle of Estana · Skirmish at Shenko Falls · Fall 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 · Jilane Massacre · Siege of the Slab · Battle of the Slab · Lightmass Offensive (Battle of Embry Square · Mission to House of Sovereigns · Ambush at the Tomb of the Unknowns · Mission to Old Ephyra · Assault on Franklin's Outpost · Mission to Lethia Imulsion Facility · Mission to East Barricade Academy · Battle of Haldane Hall · Mission to Timgad · Battle on the Tyro Pillar) · Ambush at Sovereigns Boulevard · Evacuation of North Gate · Mission to Tollen · Battle of the Tollen Dam · Evacuation of Speyer · Evacuation of Fort Reval · 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 City (Raid on Pomeroy Depot · Raid on Jacinto Med) · Operation: Hollow Storm (Battle of Stromson Forest · Assault on Landown · Assault on the Inner Hollow · Battle of Ilima · Destruction of the Riftworm · Mission to New Hope Research Facility · Assault on Mount Kadar · Mission to Nexus · Siege of Nexus · Battle of the Royal Palace · Assault on Jacinto City · Sinking of Jacinto City) · First Mission to Merrenat Naval Base · Skirmish South of Port Farrall · Second Mission to Merrenat Naval Base · Battle of Port Farrall · Ambush Outside of Port Farrall
15 A.E. Skirmish in the Kashkur Foothills
17 A.E. Skirmish at Endeavor · First Battle of Azura · Victory Day (Battle of Centennial Bridge · Ambush on Hanover Coast · Battle of the Deadlands · Battle of the Anvegad Plains · Battle of Anvil Gate · Mission to Halvo Bay · Skirmish in Concord · Mission to Mercy · Mission to Char · Battle of Endeavor · Second Battle of Anvil Gate · Incursions in the Serano Ocean · Second Battle of Azura · Battle of Pinnacle Tower)
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