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This article is about the UNSC operation. For the Covenant starship weapon, see Plasma torpedo.
Operation: TORPEDO was a UNSC operation to eliminate a Covenant refinery on the inhabited moon Pegasi Delta, orbiting 51 Pegasi B, in the 51 Pegasi System. The engagement took place on July 3rd, 2545. The outcome was a UNSC victory, but at great cost. All participating SPARTAN-IIIs, with the exceptions of Tom-B292 and Lucy-B091, were killed. However, all Covenant forces groundside, as well as several Covenant ships, were eliminated.
The purpose of Operation: TORPEDO was to destroy a Covenant deuterium/tritium refinery, on the planet Pegasi Delta. These chemicals were used in the Covenant's plasma reactors, therefore making this refinery an excellent refueling plant for Covenant ships, right on the edge of UNSC space. The destruction of this supply point would triple the length of Covenant resupply and buy the UNSC valuable time to recover from the ravages of war. This time would be spent regrouping in the wake of numerous crushing defeats at the hands of the Covenant Navy.
Long-range nuclear bombardments were met with failure as the Covenant ships shot the weapons out of the sky, and neither a regular invasion nor an Orbital Drop Shock Trooper insertion were considered worth the attempt. The operation was then assigned to the newly commissioned SPARTAN-III Beta Company, attached to the UNSC All Under Heaven.
At 1135, the 300 SPARTAN-IIIs of Beta Company landed on Pegasi Delta via Long Range Stealth Orbital Insertion Pods. Nine SPARTANs died immediately, either killed on impact or by Covenant forces. Initial resistance was light, as the Covenant had not yet realized how large the attacking force was. Soon, however, Covenant Seraphs began making strafing runs, prompting the hiding SPARTANs to abandon their stealth and rush to the factory for safety. As more Seraphs appeared, a few SPARTANs attempted to hold them back with missile launchers, and succeeded in destroying two, forcing the remaining Seraphs to cancel their runs.
The Seraphs began bombing the SPARTANs, killing dozens of them. Thousands of Sangheili and Kig-Yar joined the defense. In response, the surviving SPARTANs charged, their speed and reflexes helping them kill hundreds of Covenant soldiers in a brief matter of time.
Suddenly, seven Covenant cruisers were revealed, immediately deploying thousands of reinforcements. Half of the survivors of Beta Company turned to face the new threat in an attempt to buy time for their fellow soldiers. Team Foxtrot rushed to the factory. Adam-B004 was mortally wounded, but stayed back to hold off the Covenant forces so his team could rush ahead. When the remaining members arrived, they immediately began to set explosive charges on the core. Min-B174 was setting his timer when an electromagnetic field triggered his charge, vaporizing him.
The last two members of Team Foxtrot, Tom-B292 and Lucy-B091, then jumped off a cliff and into the ocean to escape from the explosion of the core. The two nearly drowned, but managed to swim ashore, where they found that everything else had been vaporized, including the cruisers. Eventually, they made it to a waiting Black Cat-class sub-prowler, and were extracted from the planet.
Although the UNSC gained a strategic victory, it lost almost all of Beta Company. The Covenant suffered a heavy blow that would prevent them from refueling close to UNSC space.
July 3, 2545
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