Also there was a purpose to prevent rebels against the capital from fleeing to Togoku; in FUJIWARA no Nakamaro's War in 764, closing Arachinoseki prevented Nakamaro from escaping to Echizen Province where his son lived.
また中央の謀反者の東国への逃走を防ぐ目的もあり、天平宝字8年（764年）の藤原仲麻呂の乱では、愛発関を閉じる事で仲麻呂が息子のいる越前国へ逃げる事を防いだ。