The Praetor learns of Green 2's position, and thus the location of Delta Base, by tracking the captured Banshee. He orders an expedition be sent under Erda Renadee, the Battlefield Commander, to destroy the Spartan base. Meanwhile, Blue Team arrives at the dish at the top of the Codex, with a mission to encode a signal into the bursts sent out by the structure. Although they sense that something is wrong, they cannot find any Elites in the entire complex. The Elites are cloaked, setting up a checkmate move with which they can eliminate all of the Spartans at once, and thus minimize the casualties. Finally, though, Blues 1 and 2 manage to find two uncloaked Elites and reveal the potential ambush. An alarm is raised, and the Spartans prepare for battle.