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, during which Dr. Catherine Halsey was rescued 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 established an outpost while Dr. Halsey, under temporary alliance with Covenant leader Jul 'Mdama, studied the relay and discovered that her old AI Cortana was alive. She contacted the UNSC about her discovery, but they did not take any action for three weeks.
By October 17, 2558, plans were put in place to attack Jul's forces in the Caspar 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.
At some point prior to Osiris' arrival onto the planet, Promethean forces turned against Jul 'Mdama's.
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 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.
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