The Covenant (level)

Last Stand is believed to be the seventh campaign mission of Halo 3.

It takes place in a citadel.

Upon completing it on the Normal, Heroic, or Legendary difficulties, the player will earn the "Last Stand" achievement and 40 Gamerpoints.

Trivia

 * The enemy on this level could be the Flood or Covenant Loyalist.
 * Possibly the first objective would be Defend the Citadel and the last take a ship to High Charity.