Lieutenant Ho and his squad have escaped Reach on the UNSC Trebia, but this is short-lived as the Covenant has boarded the ship and are attempting a take over. After fighting their way to the hangar and destroying the Covenant boarding craft, the squad must fight off a Covenant counter-attack before eliminating the rest of the Covenant on the ship. With all of the Covenant boarders dead, the ship enters Slipspace and retreats as Reach is glassed.