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Regarding the conscripted units. This is also a very random-dependent battle due to morale and the damage range of the griffins. But the tactic is correct. You just need to hold the troll block for as long as possible. In the walkthrough, there probably aren't any losses among the monks, but I was already too lazy to find the right random outcome. The initial setup is as in the save file. It's also interesting to note that it seems you could take fewer monks and it would be easier to maintain the troll shield.