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They need two turns to reach your army; in that time, your archers and ballista will take them out. And when they finally arrive, others will be waiting:smile19:
It seems you don't understand the core concept of using a ballista. With it, you don't really need a large army, just a small mobile one. And if you have an army capable of defeating a large group of devils in two rounds, then a ballista is unnecessary.

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!