The team met a gnome cleric, who guided them through tunnels under the Elf Watchtower (currently occupied by a hostile Orc army).
Several undead were fought and defeated. (Eventually, the team needs to find out where these zombies are coming from.)
Also, a gelatinous cube holding a magic dagger was defeated.
The team wound up in a chamber directly beneath the tower, a hole in the ceiling leads up to what is probably a basement.
500 XP for everyone.