The Invasion
Soon after the UAC opened its first Gate, the minions of Hell made their first attack. Suddenly, through the Gate flowed spiked, fanged, dripping techno-terrors. Meat machines flailed their armored limbs and slavered with bloodlust, seeking soft bleeding manflesh to rend. But in their seeking, they found only death. The United States Space Marine Corps was prepared for such an event, and they poured molten death into the hordes of Hell. More demons massed, hoping to overwhelm the defenders by their endless numbers. But mass alone was no match for the marines. Set up in defensive positions around the gate, the marines were able to slaughter
the monsters by the hundreds, taking few losses.
As suddenly as it had begun, the invasion ended. The last flaming skull screamed through, was hit by twenty simultaneous shotgun blasts, and the chamber was silent once more, except for the dripping of blood. Hell had failed.
The research went on, more boldly, and less cautiously. All the marines received the Silver Star from a grateful government, and the UAC made an enormous contribution to the Veteran's Fund. The defensive positions were strengthened, and the marines watched closely for another attempt, all their attention drawn inward towards the Gates. They were looking in the wrong direction.
The Rain of Monsters
Hell knew more than one trick. Months after the Gate incident, the yearly supply ship came ahead of time. On radar, the ship looked far larger than usual. And it was coming from the wrong direction. Strange, but not inexplicable. The lax radar operators reported the ship's approach, and personnel went out to the landing field to meet it. But it never landed. Instead, it hovered over the base, miles in the air. The men and women looked up at it, and saw that something was terribly wrong.
The ship could not have come from Earth. It was huge, kilometers long, and was built of bone, steel, flesh, corruption, and death. It was a bio-mechano-magical construct from the depths of Hell and It had come through space for its vengeance. Enormous doors, large as football fields, irised open and hideous demons poured out, plunging to the ground and blanketing the entire base with their throbbing, pulsing bodies. They were everywhere at once. The marines' defenses, set up to prevent an attack from the direction of the Gate, were worthless. The monsters poured through the sewers, the air vents, the hallways, everywhere, rampaging, corrupting, and feasting.
Once more, the surviving humans were left as zombified brain-dead monstrosities. existing only to kill and kill and kill.