The NCR-Enclave War was a military conflict waged between the New California Republic and the remaining Enclave presence in New California, with the Brotherhood of Steel taking advantage of the Republic's successful assault on Navarro to hunt down the few Enclave personnel that escaped the doomed facility shortly afterward. The conflict began some time after Control Station Enclave's destruction and ended sometime after Navarro was destroyed.
Not long after the destruction of Control Station Enclave and with the subsequent deterioration of the Enclave command structure, the remaining personnel knew that it was only a matter of time before their positions in New California would remain untenable. In 2242, the remainder of the command structure's military forces was rallied by John Henry Eden[Non-canon 1] and led by Colonel Autumn's father to Raven Rock,[Non-canon 2] leaving Navarro lightly garrisoned. Knowing the inevitable, some of the Enclave personnel fled with their families and comrades.
Several years after the destruction of the Oil Rig by the Chosen One, the NCR, convinced that the remaining Enclave forces were a threat to security of the region, staged a full-scale assault on Camp Navarro. The NCR proved victorious, either capturing or destroying the base. The surviving Enclave personnel scattered across the west coast, thus being cut off from their leadership entirely, hunted by both the NCR and the Brotherhood of Steel.
The few surviving Enclave personnel in California that did not retreat with the rest of the Enclave either went rogue from the Enclave entirely, fled east or remained in the west and went into hiding and those that integrated into the NCR did so by hiding their identities. As any that were discovered were arrested and tried for war crimes and either imprisoned indefinitely or executed. Some were able to reach as far as Nevada, where the NCR's more tenuous presence along the frontier gave them the opportunity to quietly blend into large towns.
Not long after the engagement, friendly relations broke down between the victorious NCR and their Brotherhood allies and the Brotherhood War began soon thereafter.[Non-canon 3] After sacking Navarro, the NCR recovered an item with the markings of the Divide's military installations. This package was a detonator that contained missile launch codes that, within range, would activate the launch computers within a silo. When the Courier delivered this package to the Divide, the detonation signal activated the nuclear missiles below ground, causing the earthquakes and radioactive storms that shaped the Divide into what it is in the 2280s.[Non-canon 4]
- The Courier: "Tell me more about the tribal."
Marcus: "We were looking for a to save the village of . Eventually, we did. Nuked an oil rig in the process. We went separate ways after that. I went east into the Rockies, looking for other mutants like myself. Don't know what happened to my friend. "
- The Courier: "What happened to Navarro?"
Arcade Gannon: "After the Enclave's command structure fell apart, it was only a matter of time before Navarro was overrun by NCR forces. My mother and I left with some of the troopers from my father's old unit, the same people I've kept in contact with over the years. Anyone who didn't get out was killed by the NCR. Even some of the ones who escaped were eventually hunted down by the Brotherhood of Steel."
(Arcade Gannon's dialogue)
- The Courier: "What happened to the Enclave oil rig and Navarro?"
Judah Kreger: "Internal sabotage took down the oil rig - never did get the full story. The NCR took out Navarro, saying we posed a threat to the region."
(Judah Kreger's dialogue)
- The Courier: "I thought the Brotherhood were all wiped out at HELIOS One. How could they have survived?"
Cassandra Moore: "After the battle, we consolidated our hold on the plant before pursuing our enemies. It was a mistake, to be sure, but there wasn't really any place for them to go. When we finally gave chase, however, they had simply vanished. Some of our people think they had some means of conveyance, like the Vertibirds the Enclave used, and hightailed it out of here. I think that they found someplace to hide close to HELIOS, and never went that far at all. Any other questions?"
(Cassandra Moore's dialogue)
- William Brandice's computer terminal entries.
- Fallout: New Vegas loading screens: "Though they were a powerful force in the west decades ago, the Enclave has not been seen or heard from in the Mojave Wasteland for years. Members who were not hunted down are believed to have traveled east - or successfully integrated into the NCR."
- The Courier: "Where did the Enclave go?"
Arcade Gannon: "A lot of different places. I only know what I was told. Some of them were cut down by the NCR and the Brotherhood. Some of them went east. My mother never told me what happened to my father, but she and I went south with some others and integrated into the NCR. When the NCR learned that Enclave personnel had integrated, we kept moving to the fringes. It's one of the reasons why I wound up out here."
(Arcade Gannon's dialogue)
- Fallout 3 Official Game Guide Game of the Year Edition p. 41: "The Enclave
"In the recent past, the Enclave—the remains of the United States government—were evacuated to an oil rig off the coast of California. Little is known about what happened to these forces, although the country has a new commander-in-chief: President John Henry Eden. However, recent reports and chatter have pinpointed the resurgence of the Enclave, with their base centered on a secure underground facility known as Raven Rock. Initial contact was made there 35 years ago."
"During this time, the new President Eden has been slowly rebuilding his resources, thanks in part to the technology already available at the Raven Rock military base. Vertibirds, weapons, and robots were easy to construct, but human followers were more difficult to find. The answer was to rely on Colonel Autumn, who controls the Enclave soldier forces, as well as creating a propaganda-spewing series of Eyebots sent to roam the Wasteland, spreading hope. Eden could spout his pro-government rhetoric, and promise a return of the pre-war America of legend: a land of white picket fences, baseball, apple pie, and good, old-fashioned American global supremacy."
"President Eden's secretive plan all along has been to rule over an America of the "pure," free from any mutation. He has learned of a ridiculously ambitious experiment known as Project Purity, and knew the time to strike had come: His Enclave forces would "reclaim" the Jefferson Memorial. By controlling the purified water, Eden would control the Capital Wasteland, and the rest of the country eventually. What better way to administer modified F.E.V.- which kills anyone infected with any form of mutation-than through the water supply?"
(Fallout 3 Official Game Guide faction profiles)
- Fallout 3 Official Game Guide Game of the Year Edition p. 66: "Colonel Augustus Autumn
"Autumn grew up on an oil rig off the California coast (the base of operations for the Enclave, the secretive contingent of the United States government that survived after the apocalypse). His father was the high-ranking Enclave scientist on orders from the president to move all high-ranking officials to the only other secure Enclave location with a functioning ZAX super-computer, Raven Rock. Colonel Autumn has proven to be far less subservient than his scientist father, often openly disagreeing with the president's decisions."
(Fallout 3 Official Game Guide Game of the Year Edition Wasteland Census)
- Fallout: New Vegas Official Game Guide Collector's Edition p. 43: "Brotherhood of Steel
The Mojave Brotherhood operated freely amid the Vegas wastes for several years, carrying out many reclamation missions without serious opposition. The balance of power shifted in 2251, when a large contingent of NCR troops entered the region and occupied Hoover Dam. Conflict was inevitable. Nearly two years of guerilla skirmishes culminated in a pitched battle at HELIOS One, a solar energy plant the Brotherhood had been refurbishing for several months with the goals of bringing it back online and activating its hidden offensive capabilities (the ARCHIMEDES II death ray)."
(Fallout: New Vegas Official Game Guide faction profiles)
- Chris Avellone talks about the package from Lonesome Road