NCR-Enclave War

The NCR-Enclave War was a military conflict waged between the New California Republic and the 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 with the decisive sacking of Navarro.

War
With the destruction of Control Station Enclave and 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 was rallied by John Henry EdenFallout 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) and led by Autumn Senior to Raven Rock, 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.

Outcome
The few remaining Enclave personnel in California that did not retreat with the rest of the Enclave either were recruited by the NCR, 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.

The majority of the Enclave's remaining personnel were able to relocate to other parts of post-war America. The most noteworthy examples would be in the Capital Wasteland and Chicago.

At least one Enclave installation, a former Vertibird refueling station in the Mojave Wasteland, managed to avoid being discovered by the NCR and local Brotherhood of Steel.

Not long after the engagement, the NCR-Brotherhood War began. After sacking Navarro, the NCR recovered an item with the markings of the Divide's military installations, alongside lots more advanced technology they couldn't even begin to understand. This package was a detonator that contained missile launch codes that merely needed to get within range and activate the launch computers within a silo. When the Courier delivered this package to the Divide, the detonation signal activated the ICBMs below ground, causing the earthquakes and radioactive storms that shaped the Divide into what it is in the 2280s.

Appearances
The NCR-Enclave War is mentioned in Fallout: New Vegas (in the quest For Auld Lang Syne) and its add-on Lonesome Road.