Goblins at the Gate

Publisher's blurb: A goblinoid host amasses outside the front gate of your keep, intent on claiming the stronghold as their own. It's a knock-down, drag-out brawl at the front door. But the frontal assault is just a distraction for the two infiltration teams to slip past your defenses.... A One-Shot Stonghold Adventure for 9th- to 11th-Level Characters!