How can I kill a goblin in a pit?

How can I kill a goblin in a pit? - Man in Brown Hoodie Standing Near Road during Night Time

I have a goblin in a 5 z-level deep pit. The problem is that all of my dwarves get scared when they come close to him and drop whatever they're doing, even though he is behind fortifications. I would like to have him killed, except every time I try to remove the fortifications to have my military kill him, the carpenter gets terrified and runs off.

I don't have lava. How can I kill him?

dwarf-fortress

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