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The sinking of Tollen and Montevado was a major offensive from the Locust Horde in the aftermath of the Lightmass Offensive. Showing the COG, the last remnant of the human race, that the Horde survived the Lightmass Bomb and able to sink whole cities noting seen since E-Day.


In the aftermath of the Lightmass Offensive, and the death of General RAAM, the Locust deity Rift Worm was awakened, which Skorge, the Kantus high priest, used to attack the last human stronghold.[4][5] The Locust Horde planned to destroy key cities that surrounded Jacinto City, attempting to destroy the last of the COG forces and drown the Lambent Locust with sea water.[6]


The Locust counterattack began with sinking of COG outposts and military installations[7]. These events went under the radar since Serans were used to the E-Holes. But nothing prepared the COG or the human race for what was happening under Tollen and Montevado.

The Sinking[]

Despite their greatly diminished ground forces, the Locust still attempted daring raids into COG control zones and ambushed Gear squads in patrols[8][9]. The sinking of Tollen and Montevado was a major event in the Locust War. It showed that the Lightmass Bomb failed to kill all the Locust forces.

Mission to Montevado[]

Main article: Mission to Montevado

Delta-One KR is shot down

After the Mission to the Pirnah Badlands Delta squad was sent to investigate seismic activity. In route to the city a Seeder shot them down.[10] Delta-1 was able to reach Montevado but were attack by a Brumak. Cole was able to blast the Brumak's right arm with a Boom Shot and Baird trapped it under giant rocks with a help of the Centaur Tank. Delta ordered Sigma Squad back to Jacinto and to take Lily with them[11]. Delta enter the city while the sun was going down. They found only one Stranded telling them the city is a death trap and only two other stranded and small settlement quarter of mile away was left. But a pack of Wretches attack them killing the Stranded. But after defeating the wrenches the city began to sink[12].

Mission to Tollen[]

Main article: Mission to Tollen
"The whole damn place is filling up with water. Help us, you bastards"
— Last message from Tollen.

In the aftermath of the evacuation of North Gate. Coalition High Command sent Delta Squad to investigate the flooding of the city. The city was located approximately two hours from Jacinto. Delta Squad, along with Sgt. Mataki, were dispatched via King Raven helicopter to recon the area, but not to rescue Stranded. Upon their arrival, Delta Squad realized that water had not flooded the city; instead, the city had sunk and turned into a massive lake, ten kilometers across. The lake was perfectly round, and appeared almost artificial. The Raven pilot thought it was caused by methane gas, and quickly flew away for fear of his vehicle going down. Baird, and perhaps Marcus, thought differently. Baird thought it was the Locust, although he didn't know how they had accomplished such a feat. It would later be discovered that the actions of the Rift Worm were responsible.[13]


After realizing that both the Tollen and Montevado sinkings were not natural and was done by the Locust, the COG High command decided a counterattack into the Inner Hollow would be the only way to end the war once and for all. Before the Rift Worm was killed by Delta-One, however, it sank the city of Ilima.


  1. Gears of War:Aspho Fields pg.378
  2. Beneath the Surface: An Inside Look at Gears of War 2
  3. Gears of War:Hollows Issue 3
  4. Gears of War 1
  5. Gears of War 2 collectibles
  6. Gears of War 2 act 4,5
  7. Beneath the Surface: An Inside Look at Gears of War 2
  8. Gears of War:Aspho Fields
  9. Gears of War:Hollow
  10. Gears of War:Hollow issue 3
  11. Gears of War:Hollows Issue 4
  12. Gears of War:Hollows Issue 4
  13. Gears of War:Aspho Fields pp381-385
Locust War
0 A.E. Emergence Day (Emergence in Jannermont · Emergence in Mattino Junction · Emergence in Ilima · Emergence in Porta Ogari · Emergence in 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 · Bombing of Downtown Halvo Bay · Ambush on the Halvo Bay Courthouse · Battle of the Plaza)
1 A.E. Battle of Kaia (Battle of Jasper · Battle of Autrin) · Battle of Bonbourg · Second Battle of Jannermont · Fall of Ostri · Battle of Andius · Ambush on Voslov Bridge · Hammer of Dawn Strikes · 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 · Lightmass Offensive (Battle of Embry Square · Mission to House of Sovereigns · Ambush at 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 · 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 · Siege of Nexus · Battle of the Royal Palace · 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 · Siege of Azura · Victory Day (Attack on the Sovereign · 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 · Incursions in the Serano Ocean · Battle of Azura)