《旧唐书·本纪·卷十九》
平常一般情况下，各地区互相援助，防御敌人，保卫地方；发生变乱的时候，则做另外的安排。
比以委人太轻，军威不振，境连内地，不并海南。
On normal, ordinary days, the various circuits aid and support each other, defending against enemies and guarding their territories; when turmoil erupted, different arrangements would be made.