Brotherhood of Steel (Fallout BOS)

The Texas Expedition was a military conflict between a part of the Brotherhood of Steel and the Attis Army, that began at some point after 2198 and ended in 2208 with the destruction of the city of Los and the Secret Vault.

War
Some years after the Brotherhood of Steel airships expedition and the rise of power the Attis Army, Rhombus, now High Elder of the Brotherhood of Steel, thinking that Attis Army were a threat and demanded during the elder council that the Brotherhood looking after them. But the elder council answered in the negative, because of the former expedition grow by similar ambitions (track down and assess to the extent of the remaining super mutant threat) against the Gammorin's Army, and the incident ensuing that divided the Brotherhood, created a splinter faction of the Brotherhood of Steel.

But Rhombus, didn't listen to the elder council and starting a crusade against the Attis Army. With some Scribes and Paladins, he mounted a new expedition and began tracking the Attis Army. They followed their trail to Texas and there, he discovered the Vault Prototype, an abandoned vault prototype dedicated to the Secret Vault project and installed the main base of the Brotherhood of Steel in Texas. They began to search for information and to hire new recruits to swell their thin ranks.

In 2208, Jane, the Raider Matron and their contact in the town of Carbon, reported movement of super mutants, and therefore Rhombus decided to go to Carbon with a group of Paladins. Her information indicated their next destination, the ghoul city of Los. Arriving in Los, a battle broke out beetween the Attis Army, the Church of the Lost and the Brotherhood Paladins. The Brotherhood of Steel group was annihilated and Rhombus was captured. Attis used this confusion to his advantage and managed to get into the Secret Vault. But to access the laboratory section, he had to get a key card, only possessed by the Church of the Lost.

Later, Rhombus was liberated by the Initiate. After, Rhombus assisted the Initiate to the truck where he had hidden the key card. Once in destination however, he is blown up by a ghoul suicide bomber. Unable to continue fighting, he gives him the key card and entrusts the task of stopping the Attis army and find the Secret Vault entry. The Initiate comes to the Secret Vault and triggering the self-destruct system, destroying both Los and the Secret Vault The Brotherhood of Steel contiengent was victorious, and the Attis Army destroyed, the Brotherhood of Steel contingent probably returned to Lost Hills.