The Defense of Fort Men's room.
(Fallout 3 Wanderer's Edition)
Old ruins were always good for salvage. Guns, spare parts, sometimes even food and water. Chase should have taken the twisted metal beams around these buildings as a warning, but they seemed relatively untouched; an opportunity too good to pass up.
Upon entering the building, his mistake became clear. Gore bags, skeletons, and heavy footsteps gave this away as a Super Mutant base. Turning to the door, he found that it had become stuck, and would need forcing open, and the noise from that would surely draw attention. Chase checked his guns, and took stock of the area. the large desk would offer good cover... from one side. The rubble would make staying mobile difficult. But the bathroom... the door was mostly intact, and what was left of the thick hardwood seemed in good shape.
Chase took a chunk of concrete from near his feet, he slammed it against the door. The door barely budged, and the concrete was weak from age and broke upon impact. This also alerted every mutant in the building to his presence.
The  mutant that was sent down to investigate saw Chase duck into his makeshift shelter, and yelled for backup. Chase rewarded him for this with a 7.62 round to the forehead. Two more came from the hall, and he was able to hit one before seeing that the other was carrying a shotgun. The shot rang through the offices, and while the majority of the pellets hit the door, Chase was slow to duck, and had his head thrown back.
It took him several seconds to realize, part of that shot hit the reinforced Kevlar of his helmet. Old Carlson's words echoed in his mind "Always wear your helmet boy" He was safe, but was going to have a hell of a headache.Â
Mutants began coming in greater numbers now, barely manageable with his rifle. Suddenly, one of twisted monsters that the mutants used as shock berserkers charged the door, Chase unloaded into it, but not before it was able to rip it from the hinges. He quickly retreated behind a stall wall, and braced for the impending shitstorm.
As the remaining mutants closed in, guns blazing, the concussion from the shot his helmet blocked began to set in. Pulling his shotgun from its bandolier, Chase began emptying the weapon into anything that entered the room.
The next few minutes were a blur of violence, blood, and bullet casings, but when Chase came to, he found one of the mutants had died on top of him, and the beings thick muscle had protected him from much of the fire while he shot from under it. The amount of shots it protected him from became apparent when he managed to get out from under it. The entire other side of the creature looked like it had been taken to a giant belt sander, reminding Chase of that old Holomovie about the cyborg cop.
After a shot of morphine, Chase stripped the mutants of ammo and guns for spare parts, climbed over the mound of greenskins at the door, and left for Megaton for medical attention, repairs, and to tell this story to the other scavengers at the bar.