Once you get more experienced that purge becomes easy, @AfterlifeWeirdo . They don’t hold a candle against top tier thralls with decent gear. But at that time I sweat my arse to get rid of them. My best thralls were a Black Hand Captain and Sully. 
I closed the front gate. They went up an adjacent cliff and jumped down to the roofs. I had my guys guarding the entrance. That made things worse. After a while it was chaos, but I managed and loved it! 
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