On stardate 54637.3, in the year 2377, the Allegheny led the Third Fleet into the Delta Quadrant as part of the Starfleet offensive against the Borg Collective. While travelling through System J-356, the fleet was ambushed by unknown vessels. At the conclusion of the battle only the Allegheny survived and managed to send a distress call to the USS Enterprise-E. Captain Namura later identified the unknown vessels as belonging to Species 8472. (ST video game: Armada II mission: "The Cavalry")