Get a unit with 100+ HP (so that it can survive the turtle's attack) and the healing spell (you should have it by now, it's easy to get and learn). Put the tough unit at the turtle's beak (never attack with it, only defend), use archmagi to cast magic shield on it regularly and 3 other ranged units to gradually reduce the turtle's HPs.
The vampires won't do it though - they're undead and the healing spell will act as a damage spell, so try to find some griffins, horsemen or knights.
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