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Description
Since the beginning of the Covenant, the battlecruiser has consistently been the hegemony's primary mode of intragalactic transportation. For the centuries leading up to the Human-Covenant War, the CCS was involved in every major event in the Covenant's history, including both peace and conflict. Countless CCS-class battlecruisers were used during the Human-Covenant War in operations ranging from fleet engagements to glassing. They were considered among the most dangerous of Covenant ships and often spearheaded invasions.

The earliest known UNSC encounter with a CCS-class battlecruiser occurred in 2526. Two CCS-class vessels were present at the Battle of Arcadia in February 2531. Several battlecruisers were later encountered by Admiral Preston Cole's Battle Group India at the Battle of Psi Serpentis in April 2543; these ships, as well as the rest of the Covenant fleet, were destroyed when Cole's flagship, Everest, caused the nearby gas giant Viperidae to go nova. The largest known deployment of CCS-class battlecruisers was during the Fall of Reach in summer 2552, in which dozens of such vessels were used in the invasion of the planet. During the Battle of Aszod, one was destroyed by Spartan-B312 with an Onager mass driver.

As Reach was being glassed, several CCS-class battlecruisers from the Fleet of Particular Justice pursued the Halcyon-class cruiser UNSC Pillar of Autumn to Halo Installation 04; after arriving at Halo on September 19, Pillar of Autumn disabled several battlecruisers, most notably Truth and Reconciliation. UNSC forces raided the ship three times, first to rescue Captain Jacob Keyes, then to recover the captain's command neural interface, and finally to recover the ship and use it to escape to Earth. However, First Lieutenant Melissa McKay understood that doing so would allow the Flood to infest Earth; she thus severed the fiber-optic link between the engines and the bridge, causing the ship to crash and killing everyone aboard. On October 20, 2552, thirteen battlecruisers of the Fleet of Sacred Consecration participated in the High Prophet of Regret's botched invasion of Earth; only one of these vessels, Pious Inquisitor, survived, though more would be deployed to Earth during the Prophet of Truth's continuation of the invasion.

After the Great Schism erupted on November 3, CCS-class battlecruisers played crucial roles on both sides. A Flood-infected battlecruiser broke through the Sangheili's blockade of Installation 05 and arrived at Voi, Kenya on November 17; the Flood forms released by this vessel were glassed by the Sangheili Fleet of Retribution, which arrived moments later. At the Battle of Installation 00 on December 11, both sides made use of several CCS-class battlecruisers; though the Brute-led Covenant forces outnumbered the Sangheili-led Covenant three-to-one, the Fleet of Retribution triumphed, turning the tide of the last battle of the Human-Covenant War.

As the Great Schism continued throughout the following seven years, the Sangheili and the Jiralhanae-led remnants of the Covenant continued to make use of CCS-class battlecruisers. CCS-class battlecruisers were present during the Battle of Ealen IV serving within the Sangheili and Jiralhanae fleets tasked with protecting the delegates alongside the UNSC Infinity. The mercenary group under the command of Vata 'Gajat also possessed CCS-class battlecruisers during the Battle of Ealen IV. Many other CCS-battlecruisers fell into the hands of Kig-Yar scavengers and independent Sangheili factions.

Description
Since the beginning of the Covenant, the battlecruiser has consistently been the hegemony's primary mode of intragalactic transportation. For the centuries leading up to the Human-Covenant War, the CCS was involved in every major event in the Covenant's history, including both peace and conflict. Countless CCS-class battlecruisers were used during the Human-Covenant War in operations ranging from fleet engagements to glassing. They were considered among the most dangerous of Covenant ships and often spearheaded invasions.

The earliest known UNSC encounter with a CCS-class battlecruiser occurred in 2526. Two CCS-class vessels were present at the Battle of Arcadia in February 2531. Several battlecruisers were later encountered by Admiral Preston Cole's Battle Group India at the Battle of Psi Serpentis in April 2543; these ships, as well as the rest of the Covenant fleet, were destroyed when Cole's flagship, Everest, caused the nearby gas giant Viperidae to go nova. The largest known deployment of CCS-class battlecruisers was during the Fall of Reach in summer 2552, in which dozens of such vessels were used in the invasion of the planet. During the Battle of Aszod, one was destroyed by Spartan-B312 with an Onager mass driver.

As Reach was being glassed, several CCS-class battlecruisers from the Fleet of Particular Justice pursued the Halcyon-class cruiser UNSC Pillar of Autumn to Halo Installation 04; after arriving at Halo on September 19, Pillar of Autumn disabled several battlecruisers, most notably Truth and Reconciliation. UNSC forces raided the ship three times, first to rescue Captain Jacob Keyes, then to recover the captain's command neural interface, and finally to recover the ship and use it to escape to Earth. However, First Lieutenant Melissa McKay understood that doing so would allow the Flood to infest Earth; she thus severed the fiber-optic link between the engines and the bridge, causing the ship to crash and killing everyone aboard. On October 20, 2552, thirteen battlecruisers of the Fleet of Sacred Consecration participated in the High Prophet of Regret's botched invasion of Earth; only one of these vessels, Pious Inquisitor, survived, though more would be deployed to Earth during the Prophet of Truth's continuation of the invasion.

After the Great Schism erupted on November 3, CCS-class battlecruisers played crucial roles on both sides. A Flood-infected battlecruiser broke through the Sangheili's blockade of Installation 05 and arrived at Voi, Kenya on November 17; the Flood forms released by this vessel were glassed by the Sangheili Fleet of Retribution, which arrived moments later. At the Battle of Installation 00 on December 11, both sides made use of several CCS-class battlecruisers; though the Brute-led Covenant forces outnumbered the Sangheili-led Covenant three-to-one, the Fleet of Retribution triumphed, turning the tide of the last battle of the Human-Covenant War.

As the Great Schism continued throughout the following seven years, the Sangheili and the Jiralhanae-led remnants of the Covenant continued to make use of CCS-class battlecruisers. CCS-class battlecruisers were present during the Battle of Ealen IV serving within the Sangheili and Jiralhanae fleets tasked with protecting the delegates alongside the UNSC Infinity. The mercenary group under the command of Vata 'Gajat also possessed CCS-class battlecruisers during the Battle of Ealen IV. Many other CCS-battlecruisers fell into the hands of Kig-Yar scavengers and independent Sangheili factions.