Walkthroughs for custom maps.

Gunnar, I understand how to defeat them: use sand and make sure the Medusas run out of arrows. However, I need a more precise tactic, even though I won, I couldn't resurrect 2,000 harpies. I took demons and doubled my mana, but it wasn't enough.

Added 2 minutes later
That's why I wanted to clarify: do we still need harpies?