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This is purely an offline scenario. But if the crossbows were indeed used in conjunction with the crosses, then credit should be given for the skillful execution and heroic patience. Because you can't replenish your vampires' health with crossbows. If there were archers or monks instead, it would be much easier. Although, 5+5+4+4 crosses are still not easily defeated.

Барон "Vampires"
Отдай свои прошлые сны,
В сомненьях себя обрети,
В бешеном танце душа кружится!
Не думай, что будет потом,
Здесь и сейчас мы живем,
Стань хоть на миг сам собой, слышишь!