So, generally, if someone has bandits that they've managed to take alive, they'll haul them before the nearest person authorized to administer justice (which varies by area, but fortunately the army can handle it regardless). Even in Mendev they sometimes get sentenced to death, but if not, the magistrate (or whoever it is administering justice) will announce that they could by rights be sentenced to death but by the powers of mercy invested in them by the Queen they'll instead be permitted to serve in the Condemned until they die or their sentence is commuted or pardoned.
Anyone conscripted, whether into the Condemned or the rest of the army, is expected to swear that, until such time as they reach their final rest or are released from the oath, they'll be loyal to the Queen and to Mendev, uphold the Worldwound treaty, follow orders from their superiors (with exceptions designed to handle the possibility of mind control that they're choosing to interpret as covering the new illegal order rules), and not desert. The Condemned oaths generally include some additional language about renouncing whatever it was that they were sent to the Condemned for and setting their hearts on the path towards righteousness, some people think it helps them make a cleaner break with their previous lives. Conscripted clerics can usually get permission to swear to a minor variation if needed. They could probably manage to technically satisfy his rules about not ordering oaths from the bandits if they sentence the bandits to death but inform them that they'll be permitted to serve in the Condemned if they swear the oath, though that won't help with conscripts that aren't criminals.
This guy's platoon would love to go fight some bandits tomorrow, they were in the back today and basically didn't get a chance to fight. The sorcerer from this attached adventuring party just learned a new spell and is happy to go fight some bulettes. Is Blai bringing his party to fight the undead tomorrow or pulling people from one of the army's squads to accompany him?