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In October 2559, Fireteam Taurus and Fireteam Intrepid were assigned to aid Commander Sarah Palmer in securing nuclear weapons in possession of the Viery Militia toward the end of the Battle of New Mohács.
On December 12, 2559, Fireteam Taurus, composed of Hudson Griffin, Bertold Vettel, Oshiro, and Dimka, was onboard UNSC Infinity when it was ambushed by Banished forces upon arrival at Installation 07. Fireteam Taurus was pinned down by Banished boarders when Master Chief Petty Officer John-117, while escorting Captain Thomas Lasky off the ship, arrived to help. Taurus then assisted in escorting Captain Lasky to his lifeboat. Fireteam Taurus evacuated on Victor 321, and, under the leadership of Spartan Hudson Griffin, the Pelican changed its landing zone to an area south of the Silent Auditorium, where the Banished deployed three anti-air artilleries to fire at UNSC crafts. With sniper support from Spartan Nina Kovan, Taurus disabled two Banished artilleries, and witnessed an explosion on the ring fragmenting its surface.
By December 18, at least two members of Fireteam Taurus, Griffin and Vettel, have rendezvoused with other UNSC forces at the wreckage of UNSC Mortal Reverie, which had been found by Spartan Vedrana Makovich and designated as a UNSC base of operations.
On January 23, 2560, Spartan Griffin led Spartans Panago, Malik, and Sarkar in an assassination mission on the Banished War Chief Escharum. Griffin left Vettel in charge of the UNSC forces at Reverie. However, the assassination on Escharum failed. Griffin sent an encrypted message to the Reverie on January 31 before he was captured and handed over to Chak 'Lok for torture. In his message, Griffin warned the Reverie of an impending Banished assault. Under the combined leadership of Vettel and counsel of Makovich, the UNSC forces at the Reverie braced for the Banished's attack. Despite the preparations, the Banished assault under Chieftain Tremonius proved to be too much, and on February 2, 2560, Vettel made the difficult choice to abandon their position, knowing that it meant the end of organized UNSC resistance on the Ring.
Over the next month, the UNSC lost all remaining Forward Operating Bases on the fragmented section of the ring. On March 3, 2560, Vettel regrouped with Spartans Makovich, Bonita Stone, and Theodore Sorel, and a few dozen marines. They decided to enact the Rubicon Protocol: stop or slow the Banished by any means necessary and keep Zeta Halo out of their control.
On April 23, Vettel ambushed a Banished patrol and interrogated them about the whereabouts of other survivors. Six days later, on April 29, Vettel tracked down Griffin's last known location before his capture by Escharum. He correctly deduced that Griffin had been taken to Chak 'Lok's Tower. Vettel formulated a plan to take a transport skiff and slip through the defenses. However, Vettel failed to rescue Griffin. Griffin, seemingly the only surviving member of Taurus, would remain under Chak 'Lok's custody until John-117 freed him on May 28. Griffin died of his injuries in the Master Chief's arms after warning him that the Banished were after the Conservatory.
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