How do you get rid of the Prisoners that Ridding the Woods adds, and when are they purged?

Question

Accepted Answer

After the normal purge is finished, you may add up to two Prisoners to that purge. You count their fame, then destroy them. That gives at most two per purge, so they leave gradually.

Kingdom Legacy: Feudal Kingdom

How do you get rid of the Prisoners that Ridding the Woods adds, and when are they purged?