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In the early Eastern Han Dynasty, Emperor Guangwu appointed the highly learned Geng Guo as a Huangmen Attendant, and later promoted him to Wu Guan Lang Jiang.
When the Xiongnu Chanyu Huhanxie submitted a petition to become a vassal, Geng Guo advised the emperor to accept it. He argued that allowing the Xiongnu to resist the Xianbei and Wuhuan would prevent any 'late opening due to alarm' in the Central Plains, thereby securing lasting peace for future generations.
Emperor Guangwu, Liu Xiu, adopted his wise counsel.

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Open the tool →晏开之警 (yàn kāi zhī jǐng) is a Chinese idiom (chengyu) meaning “describes a period of social unrest or instability where gates are opened late due to security concerns, symbolizing a troubled and insecure era”.
晏开之警 is pronounced yàn kāi zhī jǐng in Mandarin Chinese.
Literally, 晏开之警 means “Late opening due to warning/alert”. It is used to mean “describes a period of social unrest or instability where gates are opened late due to security concerns, symbolizing a troubled and insecure era”.
晏开之警 comes from a classical Chinese story dating back to ancient China. The full story is on this page.
晏,晚也。有警急则门开得晚也。形容时世不安宁。