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in principle, the mission isn't difficult... I completed it on the first try.
First, I ran around the map, avoiding Gilraen, then I captured the two upper castles, and he holed up in the third and didn't show his face... then I gathered an army... and that was it... although it took a long time to gather the army... neutral elves joined him, so in the end, he had about 10,000 dryads and 6,000 sword dancers...