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I think I saw a description of this battle somewhere. If I'm not mistaken, you need to put the Hydras to sleep and position the Harpies next to them. Then, the Gogs will be afraid to harm the Hydra and will skip their turns. Meanwhile, the Harpy will attack and kill them one by one. This is how the battle starts, but I don't remember what to do with the Hydras afterward. This is a map by Grigory Mintchev; his maps were discussed here a couple of months ago. You can search this thread and maybe find a description of this battle.
The problem is that the Gogs don't care about the Hydras. They attack the Harpies and wake up the Hydras with fire. I couldn't make them stop attacking. I tried playing the battle with and without HD+ and without SoD_SP, but the result is always the same.