Battle of Nysa

Previous:	Battle of Suban
Concurrent:	Battle for Zeta Halo
Battle of Nysa
Conflict:	Post-Covenant War conflicts
Date:	February 29 - March 4, 2560
Location:	Nysa, Hyades system
Outcome:	Banished victory
Details Belligerents UNSC Spartan Operations UNSC Marine Corps UNSC Navy (late in battle) Swords of Sanghelios (late in battle) Banished New Colonial Alliance Commanders Chief of Staff of Spartan Operations Jun-A266 (late in battle) Spartan Commander Laurette Agryna Chief Engineer Hannah Roberts† Shipmistress Vedu 'Ehtar (late in battle) Bloodstar Ilsa Zane Chieftain Atticus Strength Johnson Academy garrison Over 50 Spartans Over 100 Marines and other personnel Eleven Pelicans Four Condors One Zheng He-class courier Reinforcement One Mulsanne-class light frigate UNSC Fearful Symmetry One A'uzr-pattern sword frigate Sword of Conjunction Three Riftborn teams Amity Wing Harmony Wing Sympathy Wing Two Spartan-IIIs AI Iratus New Colonial Alliance One Banished dreadnought Ghost of Kholo Several Eklon'Dal Workshop Phantoms Several Kaelum Workshop Banshees Several Qavardu Workshop Gravemakers Several Qavardu Workshop war-skiffs 1 Spartan-IV Several Jiralhanae Several Humans Several Kig-Yar Several Unggoy Several Sangheili Several Mgalekgolo Casualties Several Marines and other personnel Hannah Roberts Several Spartans Sinclair Four Condors One Zheng He-class courier One Riftborn operative Several Jiralhanae Several Kig-Yar Several Unggoy

The Battle of Nysa was a military conflict between the United Nations Space Command and the Banished for control of Nysa; a frontier world in the Hyades system used by the UNSC as a hidden fallback point during their war against the Created. The battle itself was predominantly centred on the Avery J. Johnson Academy of Military Science on the planet's surface, thanks to a Banished smart AI, Iratus, managing to break containment and infect the facilities wider networks on February 29, 2560. Iratus was able to disable the academy's defences and alert the Banished to Nysa's location, resulting in a large invasion force of the Banished-aligned New Colonial Alliance beginning their attack on the world on March 3.

During Iratus' initial outbreak in late February, Academy personnel were able to send out an SOS message of their own, which was picked up by UNSC-Swords of Sanghelios forces aboard Anvil Station. On March 4, a UNSC-Swords task force was able to enter the system and evacuate key staff from the Avery Johnson Academy, unable to match the tonnage of the Banished invasion in a conventional fight. As such, Nysa was left to fall to Banished occupation, with the NCA's leader, Spartan Ilsa Zane, able to retrieve Iratus for herself.