KobRa_RR
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Try not to position your units. In this case, the Birds always attack air units because they deal the most damage after the Fairies, and they have low health (I mean this specific case). If you block the air units, the Birds will always attack the Elementals. So, there is a certain logic to it. For example, when there are only 2-3 Birds left, they no longer attack the Elementals and air units (due to the fear of retaliation) and instead attack the remaining Water Elementals and Fire Elementals.
I was talking about the fact that in the second round, 4 Birds attack either the Earth Elementals or the Goblins, both times seemingly trying to eliminate my air units, but they have to fly back, so their plan doesn't work.