《元史·列传·卷四十二》
又不久，武仙派人去真定城中联络一些人为内应，夜间斩关而入，占据真定。
未几，仙复令谍者，结死士于城中大历寺为内应，夜斩关而入，据其城。
Shortly after, Wuxian sent people to Zhenjing to collaborate with some people as their inside force, then entered the city by hacking the gate at night and took Zhenjing.
<s>[INST] Identify the key themes in this Classical Chinese text and explain them in English: 未几，仙复令谍者，结死士于城中大历寺为内应，夜斩关而入，据其城。 [/INST] Shortly after, Wuxian sent people to Zhenjing to collaborate with some people as their inside force, then entered the city by hacking the gate at night and took Zhenjing.</s>
Identify the key themes in this Classical Chinese text and explain them in English: 未几，仙复令谍者，结死士于城中大历寺为内应，夜斩关而入，据其城。
user
Shortly after, Wuxian sent people to Zhenjing to collaborate with some people as their inside force, then entered the city by hacking the gate at night and took Zhenjing.
assistant