All of this needs to be done before Orange starts capturing other towns besides its initial two, and also before returning to the starting location before Green and Brown arrive. If you manage to get into this position while maintaining a sufficient army, victory on the map is practically guaranteed.
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And the losses seem to be already too great. If the losses on the garrisons were still relatively tolerable, then Xyron and then Lucifer wiped out too many units with their "Inferno" spells. And there's nothing I can do about it - they cast Inferno on their first turn, and dozens of my lizards and other units are wiped out. Below is a picture of my heavily battered army, remaining after visiting Orange. Only slightly more than half of the army remains (not counting the wyverns and birds that were given as a reward, and the hydras, of which there are as many as there were before). I'm afraid that this might not be enough for a normal battle with Green, and I will have to suffer too many losses again.
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If this Polish player had removed the stupid Brown faction, so that it could be completely eliminated, like Blue and Green, and thus allow for gradual development, it would be a normal, moderately challenging map, and not this madness. But now, I'm just jumping from one starting location to another like a flea, and it's unclear how this running around will end.