Oh FOR **** SAKE Tiberius ! Find yourself a sex-slave or a punching bag.
Anyway, Thesyn. The only special thing about Sergeant Hershy and his diabolical peasants is that they have a rather unique name and a leader. Aside from that, the scripts that deal with them are no different to Looters or Sea Raiders. So yeah, he'll spawn, spawn and spawn again, just like ALL the other unique parties in the game.
Oh, and don't pay attention to His Most Honoured Flamer-ship Mr. Maximus, he just wasn't hugged enough when he was a kid >.> ...