The short engagement known as the Destruction of the Pelagia involved the New Republic troop transport Pelagia being struck by a missile launched from the superweapon called the Galaxy Gun.
Captain Tekba, after being informed of the imminent assault by the fearsome cannon, commanded a total defensive posture for his vessel, recognizing that escape from the incoming missile was impossible within the allotted ten minutes.
The Pelagia's contingent of X-wings, along with its defensive weaponry, unleashed a furious assault on the missile immediately upon its emergence from hyperspace; however, their efforts proved futile. The concentrated fire was unable to breach the missile's robust defenses, resulting in a direct hit on the troopship, causing its complete annihilation and the death of everyone on board.
Meanwhile, on Byss, Palpatine celebrated yet another triumph.
According to The Essential Atlas, the destruction of the Pelagia occurred along the Braxant Run within grid square N-6, situated in the Weneen sector of the Outer Rim Territories.