《资治通鉴·晋纪·晋纪十九》
秋季，七月，后赵汝南太守戴开率领数千人向庾翼投降。
秋，七月，赵汝南太守戴开帅数千人诣翼降。
In the autumn, the seventh month, Dai Kai, the governor of Runan, Hou Zhao, led thousands of people to surrender to Yu Yi.
<s>[INST] Identify the key themes in this Classical Chinese text and explain them in English: 秋，七月，赵汝南太守戴开帅数千人诣翼降。 [/INST] In the autumn, the seventh month, Dai Kai, the governor of Runan, Hou Zhao, led thousands of people to surrender to Yu Yi.</s>
Identify the key themes in this Classical Chinese text and explain them in English: 秋，七月，赵汝南太守戴开帅数千人诣翼降。
user
In the autumn, the seventh month, Dai Kai, the governor of Runan, Hou Zhao, led thousands of people to surrender to Yu Yi.
assistant