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弩台第六十
高下与城等，去城百步，每台相去亦如之。下阔四丈，高五丈，上阔二丈。上建女墙，内通暗道，安屈膝梯，人上便卷收之。中设毡幕，置弩手五人，备粮水火。
虎钤经 · 许洞 · Chapter 67 of 218
弩台第六十
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