bers-rus
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I agree with Alan and Arandor.
It's necessary to consider strategies involving the "Berserk" spell with an expert-level Fire Mage... and then finish them off with combat spells.
But there's a problem here... initiative... and at least two Archangel units need to be positioned right next to each other immediately...
And you can try to seize the initiative by lowering the morale of the enemy army (there are enough ways to do that).