So kind of a long winded face palm.. but really irked me with the fun I had... I revisited DF as I do from time to time to check out the new features etc, and decided to find a good embark, got my iron and flux stone using DFHack, wanted to get a full clad steel squad up and going as quick as I could. Got 5 semi trained and kitted out relatively well. This embark was flat, no hills or Z changes, so I build a stone ring around my fortress entrance leaving a 3 wide gap for caravans, knowing I'd come back in a month or two in game time after I had the mechanisms built to get the bridge complete with lever so I could seal off if needed. My past fortresses on earlier versions have been pretty chill since the goblin sieges/ambushes stopped coming super early in game time, only the odd lycan once I ding the value point etc, nothing too crazy, needless to say I was a bit.. lax on my defensive preparations, even though I really knew better. Suddenly I am playing around with getting my paper industry off the ground and library and tavern etc (new features to me so wanted to check them out) and boom, zombie siege. No biggie I thought to myself, I'll get the squad up and ..damn can't close the bridge up.. no way to put a mechanic that close and it would take too long. So I scramble to get some dorfs up and build a makeshift wall to cover the gap, finally I go to units to see how many of these zombies to expect, thinking I wouldn't see more than a handful or two, boy was I wrong.. Page after page after page of kitted out zombies, elves, humans, dwarves, but mostly elves.. They began they're slow walk to the opening before i could get the third wall section up and my melee dworfs, green kitted in steel with spears and axes charge headlong into the thick of them. At that point I basically thought the fortress was over, I had no tertiary way to close off the fort at the time with them so close, and they were a rather impressive horde. A battle of nothing less than epic proportions ensued as my dorfs waded through them in quick fashion, at least in the beginning, one by one though they would get caught and killed, at the end of the fight there were only two of my 5 melee dorfs left, each survivor had about 2 dozen kills under their belt, and they weren't there until the battle was already well under way. Suddenly the game starts freezing and dies, I had forgot to turn on saves in LNP and had lost an entire fortress due to the fact I had just let the game run and only paused when I would step away or sleep, etc.. all of that hard work and dwarven badassery covering for my screw ups lost..