It's been a long time, but I finally saw another DF dream:
The game was fully 3D, and I was playing it inside some kind of virtual reality set. However, while the graphics were absolutely lifelike, controlling what was going on around the mines was pretty much impossible with me having to move around physically. I was ready for some Fun though, so I didn't play too carefully anyway.
Eventually I started getting announcements about people getting interrupted by creatures, so apparently the miners had dug into a cavern. I hovered down the mineshaft while the multi-racial fort inhabitants ran up for safety, and at the bottom there was a massacre going on by muscular humanoids with shiny grey skin and flat, worm-like heads. The bottom of the stairs was dug all wrong and should have been impossible to use, but designating them to be fixed in the three-dimensional interface was too difficult for the moment.
I hovered back up and designated several barracks areas around the mineshaft, drafting most of the citizens to spar there so they'd be ready when the creatures come up. Eventually the worm-men came up... and they had plasma rifles! Fortunately they had very bad perception skills in the lit up areas, so a wrestler managed to wrest a rifle from one of the enemies. Unfortunately I woke up before I saw if he could use it.