Death From Above

 is a Fallout 3 quest and achievement that is added to the game in the Broken Steel add-on.

The player is sent to assist a Brotherhood assault on an Enclave outpost at the southwest corner of the map (west of the Dunwich Building), reached via the Rockland Car Tunnel. The Satellite Relay Station is in a new area altogether and is heavily defended by Enclave Soldiers.

Talk to Scribe Rothchild
After you wake up in the Citadel's clinic, after completing the "Take It Back!" quest, you are greeted by Elder Lyons, who gives a short overview of what happened during the two weeks you have been unconscious. He then sends you to Scribe Rothchild for a more detailed briefing. Rothchild explains how the Brotherhood systematically attacked Enclave camps with the help of Liberty Prime which has proven to be far more effective than expected. The objective of your mission is to learn how the Enclave are still able to communicate and coordinate their scattered forces, even though Raven Rock has been destroyed. It is believed that the Enclave-controlled Satellite Relay Station might be able to provide answers and you are sent there to assist the assault.

Meet Paladin Tristan and support him during the assault
When you arrive at Rockland Car Tunnel, you are briefed by Paladin Tristan. As in Take It Back!, Liberty Prime will take point, with you and other Knights providing support. The first phase of the assault proceeds much like that mission, as the giant robot stomps implacably down a canyon, swatting Vertibirds out of the sky and crushing all "Communist" opposition in its path.

When the Brotherhood force arrives at the relay station, Liberty Prime analyzes it for weaknesses and then punches a hole in its wall, allowing entrance. Soon afterward, however, he warns that an uplink transmission has been detected and that an orbital strike is imminent. If you do not stay back or immediately retreat to a safe distance from the robot, you will be killed.

Liberty Prime is wrecked by the missile strike, managing to drag himself only a few yards with his remaining arm before shutting down. In the process, his head comes off; like Deputy Weld's when Megaton is destroyed, it can be activated to hear some of his anti-Communist phrases, now slurred and garbled.

Gather data from the Relay Station
The surviving Brothers regroup, and Tristan orders you to enter the base and find out what just happened. Assisted by a squad of Paladins and Operations Officer Edwards, you must fight through many Enclave soldiers before finally reaching a computer room. Encrypted codes can be downloaded from the mainframe terminal.

Return the data to Scribe Rothchild
You are told to return to the Citadel and give the codes to Scribe Rothchild for further investigation. After lamenting the robot's fate, Rothchild takes the data and directs the player to Elder Lyons. Talking to him finishes Death From Above and starts the next quest, Shock Value.

Behind the scenes

 * Liberty Prime's death sequence is a reference to the Overseer in Fallout 1; or of a wounded super mutant in a cut scene if the PC sides with the Master at the end of the game. Another possibility is a reference to Frank Horrigan's death who, after being wounded mortally, dragged his upper torso on the ground with his one arm before his head blew off.
 * The final moments of Prime also bear a striking resemblance to the finale of The Terminator, in which the Terminator has lost its legs and pursues Sarah Connor by dragging itself with its remaining hand. Liberty is similarly crippled and moves in just the same way.

Bugs

 * At the end of Broken Steel Liberty Prime's head can still be found at the Satellite Relay Station despite being in the Citadel at the same time.
 * At the end of the mission, should you choose to retrace your steps rather than leave via the roof, all of the dead Enclave soldiers will respawn without their clothing and fire on you. If the player returns a second time after leaving, it's possible that only the enemies in the room with the first staircase will respawn, and will do so with their armor and weapons intact regardless of whether or not they were looted previously.
 * At the beginning you are to speak with scribe Rothchild who then tells you to "go and take a good look at the map". After that he does nothing thus you can not move forward in that quest. The console command (with XX being the load position for Broken Steel.esm) will bypass this stage of the quest as complete.
 * When told to report to Elder Lyons does not appear in the Citadel, but instead the quest marker is way up north, on the right hand side of the river bank, between Bethesda Ruins and Big Town, on the north side of the bridge.
 * After being briefed by Scribe Rothchild to meet up with Paladin Tristan, you may arrive at the Rockland Car Tunnel only to find the door is locked and requires a key. Go back to the Citadel and speak with Scribe Rothchild again. It will then show you have completed speaking to him again and when you go back to Rockland Car Tunnel the door will not be locked. There is no key to obtain.
 * On rare occasions, when you wake up in the beginning of the mission, Fawkes will not follow you, but still be your follower. This frequently happens when Star Paladin is your follower, however. Firing them and then rehiring them will fix the problem.
 * The Death From Above achievement may unlock incorrectly, whist the game will say you have it, your overall gamerscore will not change.
 * If you go though the base with Chinese Stealth Armor the Paladins might bug out and stop moving, you'll be unable to talk to them and they'll be unable to tell you to report to Scribe Rothchild.