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[Mathalor]

So, I got my first large goblin invasion for this fort.  I have a serpentine side path dug out from the main path into my fort, with drawbridges and fortifications on the z level above.  Diagonal pathing is walled/fortified off too.  Somehow, a goblin got through the fortifications to attack my marksdwarves.  I'm guessing through the dodge mechanic?

Could a goblin climb a raised drawbridge, and then between a floor (adjacent and above the bridge) and a fortification (directly above the bridge)?

Could he have gotten there when the drawbridge raised with him standing on it?


I really didn't count on this.  How do I prevent this in the future?

[PatrikLundell]

Dodging through fortifications (and walls) is a know issue, so that's my main suspect.
Drawbridges cannot be climbed, but if there's no floor above it fliers can get in through a diagonal dive, but goblins are poor fliers, and you have a floor in the form of the bottom of the fortification.
Creatures standing on a drawbridge that's raised are tossed, and could toss it inside, but mostly they seem to end up on the floor injured where the drawbridge was (creatures on the "hinge" can be atom smashed when the bridge is raised).

[Fearless Son]

It might have to do with the positioning of your defenses.  The wiki has a bit of a primer here on where something can and cannot climb:

http://dwarffortresswiki.org/index.php/DF2014:Climber#Climbing_safety

[Mathalor]

Yeah, the whole thing is carved or constructed underground, and the goblin shouldn't have had a way in, unless the bridge raising beneath him somehow crammed him between a floor and a fortification above him, or some weird dodge mechanic.


Argh

Edit:  after reading through that, I might have to redesign.  Goblins can jump through fortifications!?

[Fearless Son]

Well, a bridge raising beneath something will tend to "throw" that thing in the direction the bridge raised.  It is possible the goblin got chucked over whatever defenses you hand and did a "climb" (i.e. it grabbed onto something) while flying through the air.  Or it just clipped through your defenses when it went rapidly airborne, in which case it is a legitimate bug. 

[reynoldsj]

I had a similar issue with what appeared to be a teleporting titan.  I'd left my drawbridge open, inviting the thing to walk into my military.  Instead it just paced back and forth in my moat.  Then suddenly, it was a couple levels down in my fort, killing my animals.  Probably a bug.