Mission 5: The Last Stand

"Within an hour of their arrival at X50, the Covenant owned the moon. But despite the ferocity of the assault on X50, the UNSC base on Draetheus-V had no idea anything was afoot because the planet's unique magnetic resonance frequently made off-world communication nearly impossible. While Spartan Davis fought to hold the line on X50, Spartan Palmer executed her plan to depart to Draetheus-V and warn them of the inevitable Covenant invasion of the colony. Palmer ordered Marines in the area to fall back to the Hornet landing zones. Only 6 marines made it there alive. They held out against an overwhelming Covenant force until Palmer managed to escape."

- Mission summary