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Yes, the third mission for Inferno (2nd campaign). There is one Inferno castle. Three elven ones.
First, I built up my army (over a week) and took the lower castle. I developed the castle as much as I could and captured all the mines in the area. Then Gilraen arrived with 4 dragons, twenty druids, and basically a ton of everything. He killed my second hero and pushed toward me.
I left to attack the second castle (top left). Captured it. I held it while Gilraen jumped over and started running around the first castle, while another hero supplied me with creatures from the second castle. He killed the second one again (Gilraen had 26 dragons, 317 dryads, 174 bowmasters, etc.) and went after the first hero again (the week hadn't passed yet). He caught up, and by then he already had 30 dragons. Where from? No one visited him, and you can only hire ents at the military outpost. Do they just grow out of the ground?