|The following is based on Fallout Tactics and some details might contradict canon.|
Raider snipers are positioned on the high and thick metal walls and bunkers, mines are laid around the main entrances, and more raider forces are encamped and patrolling the outer perimeter of the Devil's Graveyard. A direct attack access of the base was considered a "nightmare."
The leader of Devil's Graveyard raiders was Gargantua. After his raiders attacked the village of Dirt Haven, which was allied with the Brotherhood of Steel, the Brotherhood also pacified this area by destroying raider forces and killing Gargantua along with his mad servant, Psycho.
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Devil's Graveyard appears only in the Fallout Tactics demo.