So, I was just attacked by a coral hill titan. With webs. It decided to enter the fortress through the hole for a waterwheel that powered a millstone, instead of entering through the clearly demarked entrance with bridge traps, minecart cannons, and military. I had planned for this eventuality, and locked down my farms to prevent it from getting into my fort.
That bugger was the fastest Titan I have ever seen.
By the time a dwarf had pulled the lever, it was standing on the bridge, which promptly deconstructed. And then it stopped. It waited for my marksdwarves to get there, to start shooting at it. Then It launched its first web and killed half of a squad by force of impact. It charged in and killed the remaining (webbed) marksdwarves.
It skurried through my kitchens and into my tavern, where the rest of my military and about 20 visiting mercenaries waited. Everybody charged in, and spent about a page of logs bashing in its head with silver maces and chopping at its limbs with steel swords. By the end of it, every single one of the titan's body parts were wounded - either fractured or broken. Then it killed everyone. This thing couldn't even stand up, but it was more than capable of goring every last soul in the tavern.
After the bloodbath, it spent its time hunting down every citizen that did not make it to the bolthole on time, which included all of my miners. All of my citizens were trapped in that dormitory, and they couldn't even dig their way to freedom. And the Titan was once again waiting.
I opened the emergency lockdown and all of my citizens streamed forth to meet the beast. Leading the charge was Dastot Gearsummer, Mason. He met the foe with a single punch. Where silver maces, steel swords, and hundreds of bolts had failed, a single punch from an unskilled mason slew the beast.
As I rebuild the fort, Dastot shall wear nothing but the finest silk, and have a tomb made from the Titan's bone's (or whatever a coral quadruped has).