MUST BE PLAYED WITH "RAID" GAMETYPE.
On a abandoned space station Spartans have to assault the enemy base in a hallway while dodging enemy snipes.
Teams can also activate the shields on the windows, via terminals in the very center of the map, to help them progress up the hallway but be wary because the snipers can eventually break through.
Snipers can also help their teammates advance by activating shields within the hallway by shooting generators on the roof.