Capture of Project Purity

The Capture of Project Purity was the Enclave's occupation of the Jefferson Memorial, and was also an armed engagement fought between the members of the Rivet City science lab and the Enclave in the year 2277. The Enclave aimed to occupy the Jefferson Memorial and the purifier for Project Purity for their own gain, and to activate it themselves and distribute fresh, pure water to the citizens of the Capital Wasteland. It marked the beginning of the Brotherhood-Enclave War.

Prelude
After discovering a Garden of Eden Creation Kit would be needed in order to restore the purifier and start it up, James and his child arrived at the Jefferson Memorial, along with Madison Li and her research team. They aimed to reactivate the facility and bring things up and running for when the G.E.C.K. arrived.

Capture
During this, the Enclave abruptly landed at the scaffolding for the facility and raided the Memorial, aiming to capture it. James and a scientist named Janice Kaplinski locked themselves inside the purifier hub with Colonel Augustus Autumn and two of his guards. After failing to reach a settlement and Kapliniski being executed, James tricked Autumn and sabotaged the facility, flooding the room with immense levels of radiation, sacrificing himself and seemingly killing Autumn, in order to buy his child and the rest of the scientists time to escape. However, Autumn injected himself with a highly upgraded form of radiation medicine, preventing himself from dying, unbeknownst to the others. After fighting their way through Enclave soldiers in Taft Tunnel, the Lone Wanderer and the scientists reached the Citadel and were granted shelter. The Brotherhood of Steel were briefed on the situation, and Elder Owyn Lyons devised a way of approach to the situation.

Aftermath
Afterwards, the Enclave reinforced and fortified the Memorial, setting up photonic resonance barriers around the complex and artillery guns.

Appearances
The Capture of Project Purity appears only in Fallout 3.