Re-understanding of One Material from the Book Liu Yong-fu's Some Experiences

The Brief History Facts About Liu Yong-fu is mainly about some problems in the record of the returning of Liu Yong-fu from Vietnam to the mother land.There is a mistake in the exact time when Liu Yong-fu presented The Petition on Six Businesses.It was not after several presses,but at the time when Zhang Zhi-dong dispatched his messenger to convey the decree of truce.It reflected the worries about his status after his returning in The Petition on Six Businesses.The reason of his detention was that he was waiting for the reply of the Qing.