I normally play Kobold Camp so my buildings are usually shallow surface buildings mabye two floors high, with large basements.
Naturally, my Kobolds start by digging out a trench for both invader safety and fire safety (now anyways)
But before I started doing that, this happened...
I had 30 Kobolds, bedrooms 4 layers down in the mud, and 5 layers down was my food storage rooms. Above these up to ground level was my workshops, and on the top layer of the building was my Kobold Slingers and Archers training area, which doubled as their outpost.
I had a herbalist out, finding plants to gather, and had been out for probably 6 seasons or so picking herbs and saving them in my bottom layer of my fort.
An Imp spotted the poor little kobold, who ran for his life, and just narrowly avoided a fireball, which hit a tree, and caused the entire valley to light on fire.
My first basement floor was far too wide at this time to channel out a canal around it without collapsing my towers, so I began frantically paving the land around me.
I ran out of stone, and regretably.. the fire made it to my kobolds little homes around the fort.. burning their little independant homes, which were all connected underground to the main structure via tunnels.
Knowing I'd be unable to save the tower, I convinced my kobolds to play fire fighter with buckets of water to hold off the doom coming towards us, so I made wooden walls where I couldnt pave (6 squares in a row) and designated it as a pit fill up zone from above, so that the little guys would dump water to keep the area fresh and wet.
It worked until the little bit of water reserve I had on this map which they could access at the time, ran out.
the wooden wall burned, and I lost 3 heroic kobolds, all carrying burning buckets to their graves.
the grass behind the ashes of the wall, lit and spread quickly.
My kobolds had only one chance for survival now, and that was to secure the food in the basement and place it elsewhere.
When the fire hit the base of the tower, it collapsed. Killing all remaining 27 kobolds in one fell swoop during their frantic ant like survival panic.