Quote:
Originally Posted by Verjigorm
If a castle is besieged, casting the spell on that province targets the sieging force rather than the besieged force.
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...unless
you're the sieging force, of course. In which case most spells will avoid you (but not Leprosy IIRC - beware!).
TBH, I had believed that in the case of a siege where neither side involved was yours, the target army for ritual damaging spells like FFTS was chosen randomly.
While I've never used Beckoning, I don't think castles will provide any great protection.