Arîstiton, Assaulthalls, on the third reclaim due to some cart-before-horse cavern defense shenanigans, now going strong with 131 dwarfs in the year 516, 16 years after its initial founding and 11(?) since the last reclaim. The fort is very isolated due to abandoning the desert above; culturally the dwarfs are destitute, with one copy of an animal embryonics book in the library and, outside of our own almost-dead civ's history, knowledge of about four events involving big cats killing or being killed by humans. We have a map like swiss cheese from the reclaims making temporary staging forts (which were unnecessary anyway as the few rodent men left inside were indifferent on each reclaim) a 'final' fortress near the magma sea, and an in-the-process-of-being-entirely-outfitted-with-masterworks 'final FINAL' fort back near the surface.
At last count DFhack said there were ~570 rodent men on the map (down from 800) - I turned off their invasions several seasons ago and have tried a few defense designs out. I did some initial switchback kill-mazes with a marksdwarf and axedwarf squad - it worked fine, but the unending stream of combatants meant miasma, overexertion, and general stress came to be the greater issue. Additionally, there were many pockets of cavern one that were inaccessible, and the constant presence of hostiles meant that logging, roadbuilding, or tunneling to fix the issue was likely to end badly.
We have since built a water and magma pumpstack from the magma sea to the surface, and nearly the entirety of the fort is kitted out in training leather with steel axes and silver hammers, courtesy of the ratlinite from the first battle. The plan is to flood cavern one with magma to obsidianise the water and burn back the trees, then open up a revised entryway going heavy on pillboxes and ballistae. I still want the meleers to play a central role though, and I'll consider it 'mission accomplished' when every dwarf has some rodent men kills to their name. After that I'd like to pave the caverns and re-enable their default invasion settings to see whether they go extinct before my FPS becomes unrecoverable.