I remember in one of my fortresses, it got visited by a Titan.
It was long time ago, but I remember it was a Giant Cuckoo with Shell (not kidding). Anyway, I could not predict to what extent this Titan could be dangerous as I assumed it had shell, therefore I hesitated to send my just-organized-last-summer squad, even wielding steel armor with axes. For those reasons I had War Dog Cage (around 10-15 war dogs) with one War Leopard (or jaguar, cannot remember), next to the entrance (obviously connected to a lever in a Dining Hall).
Long story short, the Titan was flying around for a little while. The next moment after he decided to land quite near the entrance, swarm of dogs got released from their cage together with a cute war leopard/jaguar. But then, something unpredictable had happened, the Giant Cuckoo start walking in the opposite side, however it took attention of one war dog who was now running right towards a Giant Cuckoo!
So, I told my war dog 'good bye'. As I realized, I made a bold statement. The war dog COLLIDED with the Titan, BITING ITS {Drum Roll} EYE LIDS!!! It tore BOTH of the TITANS eyelids off!!! As soon as I saw it I sent my militia to help the Super-Dog. After chopping off one of its wings (guess they did it intentionally so it won't fly away), ... and from here I am not sure what happened. But I do believe that this dog had the final kill on the Giant Cuckoo, because I do remember one of the engraving where "...death of a forest titan... War Dog laughing.." or maybe not. In any case, the dog got of the battle with only one of its ribs damaged.
What I learn, next time in Adventure Mode, invest all your points in Biting skills, and move on biting eyelids of the Titans.
PS the fort was very promising, but, after being tired and going to sleep, I accidentally pressed "Abandon the Fortress", which got me pretty upset