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I guess there won't be any caravans?
Added 58 minutes later
It would also be possible to add a "Magic Gate" building to the Castle, which would work on the teleportation principle. You buy troops built in this Castle, on the "Magic Gate" tab, you select which Castle to move them to, and press OK. The troops are moved to the specified Castle immediately or at the end of your turn. Such a building should also be built in the destination Castle, a two-way connection. A good addition to caravans, but it costs resources and is safer.