

While SPARTAN-117's group and the Arbiter's group managed to deactivate their two assigned Barrier Towers, Johnson's force ran into heavy Loyalist resistance at the third tower, and Johnson's men were killed while Johnson was taken prisoner by the Brutes and taken to the Citadel itself. The controls were protected by Brute Stalkers and a War Chieftain.

Johnson's tower was protected by two Anti-Aircraft Wraiths, one normal Wraith, a War Chieftain lookout, a pair of Hunters, and a swarm of Drones. The tower which John-117 was assigned to take out was protected by an Anti-Aircraft Wraith and a War Chieftain as well as multiple Shade turrets, a Wraith, and a Chieftain guarding the controls. Johnson and a Marine detachment to assault the west most Barrier Tower.Įach tower was heavily protected. Commander Miranda Keyes coordinated a simultaneous assault on all three towers, ordering John-117 and a small Orbital Drop Shock Trooper and Marine force to take the first east most Barrier Tower, the Arbiter and the Elites to take the middle Barrier Tower, and for Avery J. Two Barrier Towers seen during the UNSC/Separatist assault on the Citadel.ĭuring the battle of Installation 00 in late 2552 between the United Nations Space Command/ Swords of Sanghelios alliance and the Covenant Loyalists, the UNSC and the Elites sought access to the Citadel, but were barred by means of the energy shield of the three Barrier Towers.

John-117 deactivating the first Tower Barrier. It is possible that each tower has its own power source, as deactivating three barrier towers only allowed "a small section" to fall.īattle of Installation 00 Main article: Battle of Installation 00 In or around a barrier tower, there is a cavern or tunnel that allows access behind the perimeter. The shield that the towers projected was shown to be strong enough to absorb plasma torpedoes fired from an Assault Carrier. Terminals were also shown to be put inside some.

Inside the control room, there is a large glass window that overlooks the Citadel or the spot that the barrier is protecting. The towers also have an observation platform jutting out over them, possibly to watch for threats. The final barrier tower was shown to be situated on a small plot of land with ramps that either vehicles or infantry could traverse. The second barrier tower is seen to be built in the side of a cliff and has no entrances other than the ones that lead directly into the room. The towers can be built on a variety of landscapes, with entrances if needed, as seen in "The Covenant" when the first tower is set in a small valley and has an access tunnel that penetrates through the rock. The beam required to sustain the shield is projected from both the top of the tower's spire and from the bottom. The towers on the Ark look similar to the Cartographer on the same structure, only smaller in size. Halo 2 has the barrier towers placed either inside or on top of the Sentinel Wall, due to the fact that there is a shield projected unless it is deactivated manually. Barrier Towers are seen many times in the final two Halo games.
