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{{Battle infobox
|prev=
*[[Battle of Earth (2559)]]
*[[Battle over Installation 07]]
|conc=[[Battle for Zeta Halo]]
|next=
|name=Battle of Boundary
|image=
|conflict=[[Post-Covenant War conflicts]]
|date=[[2559#December|December 14-15, 2559]]{{Ref/Site|Id=CFTomes|URL=https://www.halowaypoint.com/news/canon-fodder-tasty-tomes|Site=Halo Waypoint|Page=Canon Fodder - Tasty Tomes|D=24|M=03|Y=2025}}
|place=[[Boundary]], [[Metrome system]]{{Ref/Reuse|ET19}}
|result= '''UNSC/Swords of Sanghelios victory'''
*[[Tyrrhen]] destroyed
*Boundary's [[Lithos]] destroyed
*Sali 'Nyon killed 
|side1=*{{Icon|UNSC 2560}} [[United Nations Space Command|UNSC]]
**{{Icon|Navy}} [[UNSC Navy|Navy]]
*{{Icon|SoS}} [[Swords of Sanghelios]]
|side2={{Icon|Banished}} [[Banished]]
|side3= {{Icon|Covenant HW}} [[Order of Restoration]]
----
{{Icon|Covenant FB}} [[Sali 'Nyon's Covenant]]
|side4=
|commanders1=
*ADM [[Jilan al-Cygni]]
*CAPT [[Abigail Cole]]{{Ref/Novel|Id=ET19|ET|19}}
*[[Shipmaster]] [[Rtas 'Vadum]]
*[[SPARTAN-II program|Spartan]] [[Jai-006]]
*[[Blademaster]] [[Vul 'Soran]] {{c|defected}}
|commanders2=
*War Chief [[Severan]]{{Ref/Novel|Id=ET20|ET|Chapter=20}}
*[[The Eight]]{{Ref/Reuse|ET20}}
**Chieftain [[Gathgor]]{{Ref/Reuse|ET20}}
**Chieftain [[Ectorius]]{{Ref/Reuse|ET20}}
**Chieftain [[V'leria]]{{Ref/Reuse|ET20}}
**Chieftain [[Cassius]]{{Ref/Reuse|ET20}}
**Chieftain [[Eru'thbok]]{{Ref/Reuse|ET20}}
**Chieftain [[Kaladus]]{{Ref/Reuse|ET20}}
**Kaidon [[Dreka 'Xulsam]]{{Ref/Reuse|ET20}}
**War-Queen [[Cao'mar]]{{Ref/Reuse|ET20}}
|commanders3=*[[High Lord]] [[Dovo Nesto]]
*[[Sali 'Nyon]] &dagger;
|commanders4=
|forces1=
*[[UNSC Navy]]
**1 {{Class|Valiant|super-heavy cruiser}}
***{{UNSCShip|Victory of Samothrace}}
**[[Battle Group Omega]]
**[[Fourth Fleet]]
**[[Sixth Fleet]]
**[[Ninth Fleet]]
**[[Thirteenth Fleet]]
*''[[Akkadian]]''
*1 [[U81 Condor]]
**''[[Zulu Seven Nine]]''{{Ref/Novel|Id=ET22|ET|22}}
*1 {{Class|Winter|prowler}}
**''[[Cataphract]]''
*1 {{Pattern|Kerel|assault carrier}}
**''[[Shadow of Intent]]''
|forces2=
*Over 200 [[clan]]s{{Ref/Novel|Id=ET12|ET|Chapter=12}}
**[[Beohk Norkala]]{{Ref/Reuse|ET20}}
**[[Cruxguard of Phenthrop]]{{Ref/Reuse|ET20}}
**[[Maakra Sunbreakers]]{{Ref/Reuse|ET20}}
**[[Nwari Wastewalkers]]{{Ref/Reuse|ET20}}
**[[Sclera of Chu'ot]]{{Ref/Reuse|ET20}}
**[[Vanguard of Zaladon]]{{Ref/Reuse|ET20}}
**[[Warkeepers of Qabik]]{{Ref/Reuse|ET20}}
*Over a thousand spacecraft{{Ref/Reuse|ET19}}
*Thousands of ground personnel and assets{{Ref/Reuse|ET44}}
|forces3=*Approx. 140 ships{{Ref/Novel|Id=ET27|ET|Chapter=27}}{{Ref/Note|The Covenant fleet is described as being ten times the size of the one in the [[Battle of Venezia]] which was 14 ships.}}
*Thousands of ground personnel and assets{{Ref/Reuse|ET44}}
*Spartan [[Merrick]]{{Ref/Reuse|ET30}}
*[[Blademaster]] [[Vul 'Soran]]{{Ref/Reuse|ET30}}
|forces4=
|casual1=
*[[Battle Group Omega]]
*At least 16 other ships{{Ref/Novel|Id=ET31|ET|31}}
*Spartan [[Stefan Vídalín]] {{Ref/Novel|Id=ET30|ET|30}}
*Part of [[Zulu Blue]]{{Ref/Novel|Id=ET41|ET|41}}
*Spartan [[David McEndon]]{{Ref/Novel|Id=ET40|ET|40}}
*[[James-005|James Solomon]]
*482 {{UNSCShip|Victory of Samothrace}} crewmembers{{Ref/Novel|Id=ET44|ET|44}}
|casual2=
*Dozens of ships{{Ref/Novel|Id=Adjunct|ET|Detail=Adjunct}}
*Thousands of ground personnel and assets{{Ref/Reuse|ET44}}
|casual3=
*[[Sali 'Nyon]]{{Ref/Novel|Id=ET40|ET|40}}
*Spartan [[Merrick]]{{Ref/Reuse|ET30}}
*Thousands of ground personnel and assets{{Ref/Reuse|ET44}}
|casual4=
|civilian1=
|civilian2=
|civilian3=
|civilian4=
}}
The '''Battle of Boundary''' was a large scale engagement fought between the [[United Nations Space Command]], the [[Swords of Sanghelios]] and the [[Banished]], later joined by [[Sali 'Nyon's Covenant]], over the human colony of [[Boundary]]. The factions sought to seize control of the [[Lithos]], a gateway that would allow whomever controlled it access to and control over the [[Domain]].

Initally a battle between the joint UNSC-Swords of Sanghelios task force and the Banished, it was complicated by the arrival of [[Sali 'Nyon]] and his forces who [[San'Shyuum]] [[High Lord]] [[Dovo Nesto]] had secretly formed an alliance with. This betrayal led [[War Chief]] [[Severan]] to turn the Banished against the [[Order of Restoration]], sparking a three-way battle that culminated in the destruction of the Lithos by the UNSC. Having suffered significant causalities, the Banished and the Covenant retreated. However, the death of 'Nyon in a duel with the vengeful Severan allowed Nesto to take control of 'Nyon's [[Covenant remnants|Covenant remnant]] to continue pursuing the Order's goal of resurrecting the [[Covenant]] empire.

==Background==
===The Created and the Domain===
The Battle of Boundary was a culmination of the year-long [[Created uprising]] that upended [[Milky Way|the galaxy]] between [[2558#October|October 2558]] and [[2559#December|December 2559]]. During the [[New Phoenix Incident]] in [[2557#July|July 2557]], a human [[smart AI]], [[Cortana]], was transported into a metaphysical information network used by the [[Forerunners]] called the [[Domain]]. Here, she was able to gain control of the Domain and with it numerous Forerunner constructs including the [[Promethean]]s, a number of Forerunner [[Forerunner starship|naval assets]], and the [[Guardian Custode]]s. Beginning in October 2558, Cortana used these tools in an attempt to [[Mantle|enforce peace]] upon the galaxy, recruiting other AIs to her cause under the banner of the [[Created]] and promising them a cure to [[rampancy]] in the Domain.{{Ref/Novel|Id=ET7|ET|Chapter=7}}

The Domain had been the target of UNSC research for some time prior to the rise of the Created under the auspices of [[Project BOOKWORM]]. Through this research program the UNSC uncovered and monitored several dormant "[[Lithos]]" sites on a number of worlds, which would theoretically serve as gateways to the Domain. After Cortana's rise to power, this became ever-more important due to a key question; once Cortana was defeated who would occupy the power vacuum she once held? Throughout the Created conflict, the UNSC's remnants, working under the remains of the [[UNSC Security Council]] and key intelligence leaders like Admirals [[Octavio Morales]] and [[Jilan al-Cygni]], collated a daring plan that would theoretically allow them to take control of the Domain for themselves. The UNSC's researchers reasoned that the only hope for the UNSC to take control of the Domain from Cortana would require an individual with an identical neural pathway to Cortana (or rather, her original AI [[Cognitive Impression Modeling|brain donor]], Dr. [[Catherine Halsey]]) to step into the domain via a Lithos gateway, where they could then release a counter-AI subroutine that would eliminate Cortana and her allies from the network.{{Ref/Reuse|ET7}}

===Halsey's clone===
The question of finding a suitable individual came in the form of Cortana's creation. As a smart AI, she had been created from a live brain cloned from Doctor Halsey. During the research program to create Cortana, Halsey had created and discarded a number of failed clones, though one was secretly extracted by ONI without her knowledge. This was done under a protocol laid out by the late Doctor [[Graham Alban]], who had committed suicide years earlier due to to his ethical qualms with his involvement in the [[SPARTAN-II program]], and who held a personal dislike for Halsey. Alban's work was continued by his fellow neuroscientist Dr. [[Giovanna Kaiser]], though her death in the [[Fall of Reach]] ultimately meant that all the UNSC had to work from was a breadcrumb trail of Kaiser's notes which indicated Halsey's clone was still alive. Kaiser hid much of her notes and research inside the neural matrix that made up the core personality of [[Black-Box]], an AI created from Dr. Alban's brain and who was now in the service of ONI's [[Commander-in-Chief of the Office of Naval Intelligence|Commander-in-Chief]], Admiral [[Serin Osman]].{{Ref/Reuse|ET7}} On November 4, 2559, a {{Class|Valiant|super-heavy cruiser}} {{UNSCShip|Victory of Samothrace}} was dispatched to a [[Rossbach's World|classified frontier world]] to extract Black-Box alongside Admiral Osman, Fleet Admiral [[Terrence Hood]], and Spartan [[Charles Orzel]].{{Ref/Novel|Id=ET1|ET|Chapter=1}}{{Ref/Novel|Id=ET2|ET|Chapter=2}}{{Ref/Novel|Id=ET3|ET|Chapter=3}}

After successfully extracting Black-Box, the cruiser returned to the UNSC's hidden outpost at [[Site Z]] on [[Nysa]], where they conducted a debriefing of the admirals and recovered information from Black-Box's code about the clone, revealing her name and the location she had been sequestered; [[Chloe Hall]], in [[Mindoro]], [[Cascade]].{{Ref/Novel|Id=ET11|ET|Chapter=11}} Admiral Morales ultimately chose to use one of his long-time private contractors to find and bring Chloe Hall to the target site; [[James Solomon]], an ex-[[SPARTAN-II program|SPARTAN-II]] supersoldier formerly known as James-005. James ultimately successfully abducted Hall from her residency in a [[Miko's Wheel|criminal enterprise]] on Cascade, before proceeding to Boundary.{{Ref/Novel|Id=ET17|ET|Chapter=17}}{{Ref/Novel|Id=ET21|ET|Chapter=21}}

On [[2559#December|December 12, 2559]], {{UNSCShip|Infinity}} and her battlegroup were deployed to Cortana's seat of power at [[Installation 07]] in the [[Ephsu system]] to tackle the first stage of this plan, where they [[Battle over Installation 07|ultimately succeeded]] in destroying her.

===The Covenant and the Banished===
Outside of the UNSC, the first individual to take a similar interest in the Lithos and the Domain was High Lord [[Dovo Nesto]], the leader of the [[Order of Restoration]]; a [[Covenant remnants|remnant]] faction seeking to revive the [[Covenant]] empire. Nesto, working from the background, was able to manipulate both the warlords [[Sali 'Nyon]] (leader of [[Sali 'Nyon's Covenant|his own Covenant]]) and [[Severan]] (leader of the [[Vanguard of Zaladon]], in the [[Banished]]) into working with him, though both remained under the impression that they were to be his right hand once he established his power. Working from the Order's base on the [[shield world]] [[Cloister]], Nesto was able to uncover a Forerunner tablet enshrined with glyphs detailing knowledge of the Lithos and their locations, with one located under the human colony world of [[Boundary]].{{Ref/Novel|Id=ET16|ET|Chapter=16}} Sali 'Nyon's forces were also able to uncover information about Dr. Kaiser's research and Halsey's clone from the surface of post-[[glassing]] Reach, which allowed Nesto to formulate a plan similar to that of the UNSC with the end goal of taking control of the Domain.{{Ref/Novel|Id=ET10|ET|Chapter=10}}
<!--
Nesto allowed into to be leaked to the Swords/UNSC in order to get them to retrieve Chloe
Knowledge known to Swords of Sanghelios via relay mite. Campaign against Nesto, UNSC permission, joint-op on Venezia.{{Ref/Reuse|ET10}}
Battle of Earth and Banished retreat
Akkadian moves to Boundary
Task Force Omega moves to Boundary
-->

==Battle==
{{stub|section=yes}}
<!--

*Banished occupation/opening stages
**James' journey
**Task Force Omega v. Banished

*Sali's Reinforcements and resulting schism
*James' turnaround and orbital strike
-->
==Aftermath==
{{stub|section=yes}}

==List of appearances==
*''[[Halo: Empty Throne]]'' {{1st}}

==Notes==
{{Ref/Notes}}

==Sources==
{{Ref/Sources}}


==Ghost of the Gyre synopsis==

The story begins with a record from [[Genemender-Folder-of-Fortune|Adjutant Vigilance]], recounting his time as the [[Forerunner]] [[Lifeworker]] Genemender-Folder-of-Fortune to watch over the [[human]]s on [[Installation 07]], then known as Gyre-11. When [[Master Builder]] [[Faber-of-Will-and-Might]] claimed jurisdiction of the operations on the ring, he would take the humans to the [[Palace of Pain|Palaces of Pain]] on the ring to experiment on them to find a supposed cure to the [[Flood]], executing those who refused to comply and forcing the remaining humans to flee as a result, much as they had when they [[Plague War|first encountered]] the Flood. Vigilance then recalls how Faber used the ring on a [[San'Shyuum]] [[Battle of Janjur Qom|rebellion]], leading to many Station-tier to also rebel but were stopped by [[Builder Security]], who offered the survivors either servitude or execution. Genemender would be among those who remained loyal to his duties while some pretended to submit in order to sabotage Gyre 11, doing what he could to keep the humans under his watch safe. 

When orders from the [[Librarian]] were to have the humans [[Mind transfer|composed]] in order to deny the Builders access to information their ancestors possessed, Genemender would compose himself so that he also would not be compromised, becoming Adjutant Vigilance. After thousands of years, on [[2556#June|June 9, 2556]], he would observe humans arriving on Zeta Halo. He comments that they believe Zeta Halo is an undiscovered frontier, when they are actually unknowingly returning home.

The four humans, [[Dora Emmett]], [[Ellen Zoyas]], [[Madeline Tress]] and [[Michael Quinn]], began observing the wildlife on the Halo Ring using [[Bumblebee]]s.