Battle of Boundary

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Previous:	Battle of Earth (2559) Battle over Installation 07
Concurrent:	Battle for Zeta Halo
Battle of Boundary
Conflict:	Post-Covenant War conflicts
Date:	December 14-15, 2559
Location:	Boundary, Metrome system
Outcome:	UNSC/Swords of Sanghelios victory Tyrrhen destroyed Boundary's Lithos destroyed Sali 'Nyon killed
Details Belligerents UNSC Navy Swords of Sanghelios Banished Order of Restoration Sali 'Nyon's Covenant Commanders ADM Jilan al-Cygni CAPT Abigail Cole Shipmaster Rtas 'Vadum Spartan Jai-006 Blademaster Vul 'Soran (defected) War Chief Severan The Eight Chieftain Gathgor Chieftain Ectorius Chieftain V'leria Chieftain Cassius Chieftain Eru'thbok Chieftain Kaladus Kaidon Dreka 'Xulsam War-Queen Cao'mar High Lord Dovo Nesto Sali 'Nyon † Strength UNSC Navy 1 Valiant-class super-heavy cruiser UNSC Victory of Samothrace Battle Group Omega Fourth Fleet Sixth Fleet Ninth Fleet Thirteenth Fleet Akkadian 1 U81 Condor Zulu Seven Nine 1 Winter-class prowler Cataphract 1 Kerel-pattern assault carrier Shadow of Intent Over 200 clans Beohk Norkala Cruxguard of Phenthrop Maakra Sunbreakers Nwari Wastewalkers Sclera of Chu'ot Vanguard of Zaladon Warkeepers of Qabik Over a thousand spacecraft Thousands of ground personnel and assets Approx. 140 ships Thousands of ground personnel and assets Spartan Merrick Blademaster Vul 'Soran Casualties Battle Group Omega At least 16 other ships Spartan Stefan Vídalín Part of Zulu Blue Spartan David McEndon James Solomon 482 UNSC Victory of Samothrace crewmembers Dozens of ships Thousands of ground personnel and assets Sali 'Nyon Spartan Merrick Thousands of ground personnel and assets

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 remnant to continue pursuing the Order's goal of resurrecting the Covenant empire.