_Vladimir_
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The mission was intense! I played it on a difficult level. First, I eliminated the druids to clear the paths, then I hired 4 heroes to build up an army and control the mines, sending them to the main castle. I only left one castle for the elves! I built my army using elven units. I gathered 60 dragons and smoked Gilraen out of his castle, making him retreat.
-> Run away while gathering an army
-> Don't let him have more than 1 offspring per week
-> Keep the mines under your control
->>> Mission completed!