Battle of Kamchatka
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In 2558 a battle took place at Kamchatka, fought between the forces of the United Nations Space Command, Jul 'Mdama's Covenant, and the Prometheans on the icy planet of Kamchatka. During the battle Dr. Catherine Halsey was rescued by UNSC forces and Jul 'Mdama was assassinated.
In 2558, a long-dead communications hub on the planet's surface activated, attracting the attention of Jul 'Mdama's Covenant. Jul 'Mdama's Covenant moved to control the planet while Dr. Halsey, under temporary alliance with Covenant leader Jul 'Mdama, studied the relay and discovered that her old AI Cortana was alive. All the while, Jul 'Mdama's Covenant would gather and use the Caspar system as a staging area.
Analysts at the Office of Naval Intelligence deemed that a strike on these forces at Caspar could potentially do substantial damage against the Covenant faction, and give the UNSC an edge. By October 17, 2558, plans were put in place to attack Jul's forces in the system as part of Operation: ANCHORITE, and to retrieve Dr. Halsey as part of Operation: DESINENCE. While ANCHORITE was known widely across the UNSC Infinity with it being part of a briefing letter, DESINENCE was not, with little information being discussed about it. Part of the overall attack plans included a second wave of forces deployed from the Infinity. The Infinity would also bring a complement of Anlace-class light frigates.
At some point prior to Osiris' arrival onto the planet, Cortana seized control of the Promethean forces on Kamchakta and turned them against Jul 'Mdama. As a result, many of Jul's followers began openly questioning his leadership.
The UNSC Infinity deployed Fireteam Osiris, a Spartan-IV special operations squad, to retrieve Halsey and assassinate Jul 'Mdama if possible. They dropped from low orbit by Pelican and landed amidst an enormous ship and ground battle, as Cortana had taken control of Jul's Prometheans and was unleashing them against him. Jul 'Mdama's Covenant made little headway, with the constructs managing to bring down a Hekar Taa-pattern blockade runner and force back a Kraken walker. The chaos from the Prometheans' rebellion provided Osiris cover from 'Mdama's Covenant, allowing them to sneak to the temple where 'Mdama and Halsey were stationed.
After reaching the temple, Osiris attacked Jul's Zealot guards while Spartan Jameson Locke faced off against Supreme Leader in melee combat. After a short fight, Locke was able to kill Jul with his combat knife, bringing an end to his tyranny. Fireteam Osiris then took custody of Dr. Halsey and she was brought back to the Infinity to aid in the search for the Guardians.
With Jul 'Mdama dead and the Prometheans now against them, his Covenant troops became desperate. Some of them fled to the Argent Moon to retrieve their soldiers scavenging the station, though most of them were killed in the attempt after Blue Team scuttled the station to keep it out of enemy hands, destroying several Covenant warships in the process. Most of the rest regrouped on Sanghelios, attempting an attack on the Vadam clan burial grounds in hopes of a revenge attack against the Arbiter. Covenant forces at that were under the joint control of several other high-ranking members of the faction including Kitun 'Arach.
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