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Description
At least three SDV-class heavy corvettes were present during the Covenant attack on Corbulo Academy of Military Science on Circinius IV in 2526. At some point they entered the lower atmosphere and one of them fired on the school's space elevator, causing it to collapse.

Several SDV-class heavy corvettes were present during the Fall of Reach. On July 26, 2552, a corvette attacked the Office of Naval Intelligence's Sword Base, but retreated when its forces were driven off. As it left, the corvette was struck amidships by a round from an orbital defense platform's Magnetic Accelerator Cannon and sank in a nearby lake. At least four corvettes were present in the Covenant staging area in the Viery Territory. These corvettes and the supercarrier Long Night of Solace were part of the Fleet of Valiant Prudence sent to Reach in advance of the Fleet of Particular Justice.

At least one corvette, Ardent Prayer, was in the planet's orbit when Operation: UPPER CUT commenced. As the vessel's communications were being jammed by the UNSC, it was engaged by UNSC Savannah, which was assisted by several YSS-1000 Sabre fighters, including one piloted by SPARTAN-B312 and Jorge-052. The pilots hijacked the corvette in order to use it as a sort of Trojan Horse to destroy the Long Night of Solace. The corvette was destroyed by Savannah's slipspace drive, which was used as a makeshift bomb, also destroying Long Night of Solace, though Jorge-052 was killed in the slipspace rift. The loss of the Ardent Prayer and the Long Night of Solace effectively destroyed the Fleet of Valiant Prudence, forcing the remnants of the task force to link up with the incoming Covenant invasion fleet.

Other SDV-class heavy corvettes took part in the ground battles on Reach. At least three corvettes were present during the siege of New Alexandria. One took up position over the city's starport, preventing civilian evacuation transports from escaping. When one took off in desperation, the corvette shot it down. As the situation grew dire for the transports, SPARTAN-312 reactivated a missile battery which he used to fire on the corvette. The corvette was badly damaged and retreated, allowing the remaining civilian transports with thousands of people on board to escape. The corvette was last seen descending at a steep angle, indicating it may have crashed from the damage it sustained.

In the post-war years, SDV-class heavy corvettes continued their service with surviving remnants of the former Covenant; as of 2558, Sangheili Shipmaster Vata 'Gajat was using an SDV-class corvette as his flagship during the Oth Lodon incident. Jul 'Mdama's Covenant had several SDV-class corvettes in its fleet. A Kig-Yar pirate queen operating on Ven III used an SDV-class corvette as her personal flagship.

Description
At least three SDV-class heavy corvettes were present during the Covenant attack on Corbulo Academy of Military Science on Circinius IV in 2526. At some point they entered the lower atmosphere and one of them fired on the school's space elevator, causing it to collapse.

Several SDV-class heavy corvettes were present during the Fall of Reach. On July 26, 2552, a corvette attacked the Office of Naval Intelligence's Sword Base, but retreated when its forces were driven off. As it left, the corvette was struck amidships by a round from an orbital defense platform's Magnetic Accelerator Cannon and sank in a nearby lake. At least four corvettes were present in the Covenant staging area in the Viery Territory. These corvettes and the supercarrier Long Night of Solace were part of the Fleet of Valiant Prudence sent to Reach in advance of the Fleet of Particular Justice.

At least one corvette, Ardent Prayer, was in the planet's orbit when Operation: UPPER CUT commenced. As the vessel's communications were being jammed by the UNSC, it was engaged by UNSC Savannah, which was assisted by several YSS-1000 Sabre fighters, including one piloted by SPARTAN-B312 and Jorge-052. The pilots hijacked the corvette in order to use it as a sort of Trojan Horse to destroy the Long Night of Solace. The corvette was destroyed by Savannah's slipspace drive, which was used as a makeshift bomb, also destroying Long Night of Solace, though Jorge-052 was killed in the slipspace rift. The loss of the Ardent Prayer and the Long Night of Solace effectively destroyed the Fleet of Valiant Prudence, forcing the remnants of the task force to link up with the incoming Covenant invasion fleet.

Other SDV-class heavy corvettes took part in the ground battles on Reach. At least three corvettes were present during the siege of New Alexandria. One took up position over the city's starport, preventing civilian evacuation transports from escaping. When one took off in desperation, the corvette shot it down. As the situation grew dire for the transports, SPARTAN-312 reactivated a missile battery which he used to fire on the corvette. The corvette was badly damaged and retreated, allowing the remaining civilian transports with thousands of people on board to escape. The corvette was last seen descending at a steep angle, indicating it may have crashed from the damage it sustained.

In the post-war years, SDV-class heavy corvettes continued their service with surviving remnants of the former Covenant; as of 2558, Sangheili Shipmaster Vata 'Gajat was using an SDV-class corvette as his flagship during the Oth Lodon incident. Jul 'Mdama's Covenant had several SDV-class corvettes in its fleet. A Kig-Yar pirate queen operating on Ven III used an SDV-class corvette as her personal flagship.