Well, I haven't upgraded to .19 yet, mainly because I'm still enjoying the fact that my fort is still alive!
I have a roaming Forgotten beast made of undulating glass down in the caverns. It doesn't seem to interested in finding my fortress. It's swum past one entrance several times already. No fun for me
Then I had an Ettin attack. This was right after I'd half demolished a couple of caravans of elves, the survivors still stayed to trade. While the dwarves were happy enough to pull the lever and raise the drawbridge on the elves, they weren't so much about the Ettin. The Elves hung back, took pot shots through the fortifications and then a couple of them engaged it on my drawbridge.
It struck down one of them and crippled another and then dodged off the bridge and fell four stories into my fortress.
Badly wounded it still hauled it's broken self up and chased a lone dwarf. At this point the one ready soldier, a veteran girl who slew the first forgotten beast in the fortress, showed up to save the day. Despite her combat skill, the Ettin would not go down and during the epic clash it clawed off her lower left arm. She was forced to retreat from the bloodied beast as a second dwarf soldier, a wrestler, appeared. By this time the Ettin was so wounded that it could barely attack. That didn't stop it from evading or blocking a large portion of the attacks. Then finally a third soldier, a swords dwarf with a cleaver, helped the wrestler to finish it off.