"JD, kill it."
—Kait Diaz, after seeing the Hive Beast collapse.

The Assault on the Tollen Dam was the first major encounter of the Swarm War. The clash between the human force consisting of surviving Delta-One members as well as a group of Outsiders: two former Gears - James Dominic Fenix and Delmont Walker - and Kait Diaz, born an Outsider, and the Swarm was aimed at saving Kait's mother, Reyna Diaz, who was abducted with the rest of their Outsider community a few hours earlier. The attack took place hours after the discovery of the Swarm's existence at the Tollen Dam and its surroundings.

Order of BattleEdit

Storming the HiveEdit


The Hive Beast

Equipped with Baird's construction DeeBees, JD and Kait began making their way to the Tollen Dam. Numerous Swarm forces were between them and the destination site, including several Carriers, Snatchers and Swarmaks, but all of the opposition was destroyed by numerous industrial staples and missile barrages from Sam's King Raven.

In a matter of minutes, JD and Kait, supported by Sam's KR, manage to break through the base of the dam at 09:11 and enter the drained reservoir where after repelling a few barrages of cankers, a large creature attacked them, capable of launching quills from its tentacles as well as gestating cankers in its chest. As they tear it's tentacles off, the beast manages to shoot the King Raven down. All on the King Raven escaped in time, though they had to deal with Swarm forces on the ledge they were on. JD asked Baird about the status of the rotors, quickly using the King Raven's main rotor as a slicing shield against the beast's Cankers. After putting it on its last legs, JD killed the beast by ramming the rotor onto the beast's head, causing it to slump down the hole it came out of.

Finding ReynaEdit


Gears discover Reyna's fate.

The Gears regroup outside the cave, then enter the heart of the hive only to find Reyna attached to the Swarm's biomass, partially transformed. Kait asks Marcus if he knew, which he confirms but did not know she would be like this. Reyna tells them that if she is freed from the network, she will die and asks her daughter to euthanize her. JD objects, saying Reyna cannot ask Kait to kill her, but Kait stops him and asks him to leave so she can have a final goodbye with her mother. When Kait and Reyna are alone, Reyna asks her daughter to take her necklace. Kait starts to cut her mother off the biomass and as she continues, she breaks down. Reyna begs Kait to continue and only then Kait is able to finally euthanize her mother. Unbeknownst to either of them however, Reyna had been fully connected to the Swarm Hivemind by the time they arrived, although she was left dormant due to Kait's actions.


Kait learns her mother's secret.

As Kait exits the cave crying, JD and the others rush to her to comfort her. Marcus remarks that this war is only beginning and JD should take Kait to some safe place. She responds by saying she does not need protection and Marcus - knowing the pain of loss and the trauma caused by it - tells her she needs time to deal with the death of Reyna, not protection. She shows them her mother's necklace and declares it belonged to her grandmother, a woman she never met. Only Kait is able to see the medallion's reverse - the symbol of the Locust Horde.[1]


Following the battle, the group buried Reyna and decided to look for shelter, supplies and communication equipment in an old Outsider stash Kait visited once with her uncle, Oscar.[2] Two days after the assault, First Minister Mina Jinn sent a detachment of DeeBees to the Tollen Dam in order to investigate the site, after discussing the events of the Tollen Dam with Delta and the Outsiders in New Ephyra.[3]


  1. Gears of War 4: Act V: Gate Crashers, Release
  2. Gears of War: Ascendance: Act 1: Chapter 1 "An Invitation"
  3. Gears of War: Ascendance: Act 1: Chapter 3 "Bad Memories"
Battles of the Swarm War
42 A.E. Rescue of Fort Umson (Ambush on Fort Umson · Mission to Fort Reval · Battle of Osmium Mine Bravo · Mission to the Tollen Dam · Skirmish in Speyer · Assault on the Tollen Dam) · Skirmish in the Wilds · Ambush of South Village · Mission to Fort Umson · Mission to Orzabal Crater · Mission to South Village · Mission to Azura Research Facility · Evacuation of Settlement 2 · Ambush on Croya · Ambush on Bravelle · Hivebuster Offensive (Hivebust of Pahanu Island · Mission to Croya · Mission to Bravelle) · Siege of Riftworm Village · Second Mission to New Hope Research Facility · Incursions in Kadar Valley · Mission to Mount Kadar Laboratory · Mission to OZP-11 · Battle of Old Ephyra
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