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For cards with mandatory abilities that are not also cost-benefit abilities, you do as much as you can. If there are no single-brigade sites in play, for example, you simply don't banish one.
Are you sure about this?
OK,What about TRUMPET BLAST?"Discard an evil fortress or occupied site from play to discard all evil characters in battle."What if there is no fortress or site in play? Can I still "discard all evil characters in battle?"