《明史·列传·卷一百六十四》
周延儒应召北上时，青山去拜见他，说自己在领兵护漕，不是造反作乱。
周延儒赴召北上，青山谒之，言率众护漕，非乱也。
When Zhou Yanru was summoned to the north, Qingshan went to visit him and said that he was leading troops to protect the transportation of grain, not to rebel.
<s>[INST] Kindly elucidate the central themes in this passage in English: 周延儒赴召北上，青山谒之，言率众护漕，非乱也。 [/INST] When Zhou Yanru was summoned to the north, Qingshan went to visit him and said that he was leading troops to protect the transportation of grain, not to rebel.</s>
Kindly elucidate the central themes in this passage in English: 周延儒赴召北上，青山谒之，言率众护漕，非乱也。
user
When Zhou Yanru was summoned to the north, Qingshan went to visit him and said that he was leading troops to protect the transportation of grain, not to rebel.
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