After defeating the darkmantles, the PCs were attacked by wave after wave of hobgoblins. Included in the waves were an ogre and a handful of leopard.
After a long and furious fight in which a hobgoblin fire-tossing shaman almost incinerated the heroes, less than a dozen hobgoblin soldiers, led by a lone surviving corporal, survived. Retreating, the hobgoblins gathered up their women and children and fled to the surface.
The PCs, themselves grievously wounded from the battle, locked themselves on one of the hobgoblins’ rooms to rest.