《资治通鉴·宋纪·宋纪六》
北魏河间公拓跋齐和武都王杨保宗分别驻守在谷两旁。杨保宗的弟弟杨文德劝杨保宗据守险要，以此背叛北魏。
魏河间公齐与武都王杨保宗对镇雒谷，保宗弟文德说保宗，令闭险自固以叛魏。
The Prince of Hejian of the Northern Wei, Tuoba Qi, and the King of Wudou, Yang Baosong, each with a garrison on either side of the valley. Yang Baosong's younger brother, Yang Wende, persuaded Yang Baosong to guard the key points and thus rebel against the Northern Wei.
<s>[INST] Identify the key themes in this Classical Chinese text and explain them in English: 魏河间公齐与武都王杨保宗对镇雒谷，保宗弟文德说保宗，令闭险自固以叛魏。 [/INST] The Prince of Hejian of the Northern Wei, Tuoba Qi, and the King of Wudou, Yang Baosong, each with a garrison on either side of the valley. Yang Baosong's younger brother, Yang Wende, persuaded Yang Baosong to guard the key points and thus rebel against the Northern Wei.</s>
Identify the key themes in this Classical Chinese text and explain them in English: 魏河间公齐与武都王杨保宗对镇雒谷，保宗弟文德说保宗，令闭险自固以叛魏。
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The Prince of Hejian of the Northern Wei, Tuoba Qi, and the King of Wudou, Yang Baosong, each with a garrison on either side of the valley. Yang Baosong's younger brother, Yang Wende, persuaded Yang Baosong to guard the key points and thus rebel against the Northern Wei.
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