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I watched, the battle isn't difficult, but it heavily depends on the random distribution of our and the enemy's morale, so there won't be a universal tactic here. I won only after about ten attempts. I threw the Ring of Cold at four groups of crossbowmen at the bottom, and then I attacked with an angel. In the first couple of turns, the crossbowmen are busy attacking peasants, so the angel receives attacks from only a couple of crossbowmen, even though it's standing right in the middle of them. Then, I fly around the field and try to lower the morale on the angel or on the weak groups of crossbowmen. And, under certain circumstances, the tent survives for three rounds.