Need help with quest "The Elite Meet in Crete"

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I believe this is the hardest quest among the game so far. Any one have finished this quest?

I tried with my partner, in level 10, tons of catapult incoming which is quite ridiculous. Once i meet them, I have give up this quest. Is it possible to finish this quest?

Hope someone can share some the strategy?

I tried Egypt rush to golden age and using Palintonon while Greek defense for first 3 waves. The farthest we go is just level 10. Needing help for this quest!!!