SUMMARY
The Battle of Nuusra was a battle between the remnants of Jul 'Mdama's Covenant forces, the Swords of Sanghelios, and Spartan-IV Fireteam Osiris in the sate of Nuusra on the continent Qivro on the Sangheili homeworld of Sanghelios on October 27th, 2558. The battle began when the Covenant forces arrived in the area in an attempt to assassinate the leader of the Swords of Sanghelios, Thel 'Vadam. During the attack, Fireteam Osiris arrived to meet 'Vadam and gain access to the Forerunner Guardian at Sunaion. The Covenant attack was ultimately unsuccessful, and the Swords of Sanghelios along with Fireteam Osiris were able to push into Sunaion.
RELATED MEDIA
These events are depicted in the video game Halo 5: Guardians, which was the subject of a Spoilercast on November 9th, 2015.