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Personally, Gilraen ran around empty and died as soon as he was encountered for the second time... But then another elf hero arrived, quite well-leveled, with maximum Logistics, making it difficult to escape him... plus, it seems he has a spell to summon creatures from castles, because while we were playing cat and mouse (I was running, of course), his army grew like crazy... And you can't stop, because he's constantly on your tail... I tried to break through to the upper castles - no luck... there are many dead ends, and sooner or later he corners me... and then nothing can save me...
Added after 21 hours 40 minutes
I completed the mission... In principle, completing the mission is a matter of chance. Each time, the computer behaves differently. In my third attempt, the enemy didn't leave the upper right castle until I got close. Although the advice that it's better to develop the elven castles, not your own, was helpful :)
By the way, diplomacy didn't help me much... Only every tenth squad from those I encountered joined me. The rest just ran away... Or fought...
And I couldn't hire an elf hero at all, because they always offered others.