Destroying stuff in sieges

[Major Robert Dump]

Enemy burned up my gatehouse with fire arrows last night. The guys I had stationed in there took mass casualties from the fire

[Cecil XIX]

Sorry for bringing back an old thread, but how exactly is it possible to use fire arrows against structures. Simply right-clicking on them as if they were people doesn't do anything. I notice it does seem to be possible for a split second after clicking the fire arrow button, but that just seems to cause the archers to walk up to the structure rather than shoot at it.

[Maltz]

I have noticed that, too. It would be nice if we can use Bow Warrior Monks' fire arrows to destroy an arrow tower from outside its range.
But maybe that's exactly why it is prevented.