《明史·列传·卷一百四十八》
士秀、应金在文灿的军队里，一天假装请假，借用了良玉的旗号混进许州城。
良玉久征不归，士秀、应金在文灿军中，伪请急，假良玉军号入城。
Shi Xiu and Ying Jin were in Wen Can's army, one day they pretended to ask for leave and borrowed Liang Yu's banner to sneak into the city of Xuzhou.
<s>[INST] Kindly elucidate the central themes in this passage in English: 良玉久征不归，士秀、应金在文灿军中，伪请急，假良玉军号入城。 [/INST] Shi Xiu and Ying Jin were in Wen Can's army, one day they pretended to ask for leave and borrowed Liang Yu's banner to sneak into the city of Xuzhou.</s>
Kindly elucidate the central themes in this passage in English: 良玉久征不归，士秀、应金在文灿军中，伪请急，假良玉军号入城。
user
Shi Xiu and Ying Jin were in Wen Can's army, one day they pretended to ask for leave and borrowed Liang Yu's banner to sneak into the city of Xuzhou.
assistant