Marlo_Stanfield
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Yes, I used two fewer monks and finished the battle without losing any monks. The key is not to completely eliminate the stack of Royal Griffins in the middle of the battle, so they continue to support the trolls for a little longer.
P.S. I struggled a bit more and managed to complete it, preserving two trolls and not losing any monks. Dividing the trolls into groups of 6, 3, and 4 solved the problem. It shouldn't get any better than this, I think.
And here's a video at the end.
https://youtu.be/VPFokkcCB-o