What "coup" did Sun Quan's brother-in-law Xu use to avenge her husband?

Xu lied about her husband's death, secretly contacted reinforcements, and killed the rebel Gui Lan. In 2003, Sun Yi was the prefect of Danyang, and a new official took office. He repeatedly accused officials Gui Lan and Dai Yuan of not doing a good job, so Gui Lan and Dai Yuan held a grudge. They bribed a family general named Bian Hong around Sun Yi, intending to let him kill Sun Yi. A year later, Sun Bin is going to hold a banquet and ask his wife Xu for divination. The result of Xu's divination was evil. He advised Sun Yi not to hold a banquet. Sun Yi insisted on this point. Then at this banquet, Bian Hong killed his master. Bian Hong was killed to cover up the facts.

Gui Lan and Dai Yuan wanted to dedicate Danyang to Liu Fu and then defected. Gui Lan broke into Sun Yi's house, took all Sun Yi's women for himself, and then made Xu his concubine. Of course, Xu refused. No matter how stupid she is, she knows that her husband was killed by Gui Lan. How can she marry a man who is not * * *. But when people forced her with a knife, Xu wiped away tears and said, I can marry, but can I keep my husband's filial piety for a month, so that I can get by on my face and be married to both husband and wife?

Gui Lan, that sounds good. This woman is quite long. Besides, I married someone's wife as soon as her husband died, and the public opinion was not good, so I agreed to this matter. Gui Lan left a mind's eye and sent a confidant to see what the Xu family was doing at home. But the news from the confidant is that Xu is fine, burning paper and crying every day, which is in line with the image of a wife who has just lost her husband. After reading it, I felt very good and normal, so I relaxed my supervision and concentrated on his wedding.

Wait until the wedding day, Gui Lan to pick up the bride, see the room is full of red, the xu also dressed up beautifully. He can't help feeling high, thinking that this is also a double harvest of career love. When Danyang is given to Liu Fu, he will definitely go to by going up one flight of stairs, and then he can show the beauty the stars. Unexpectedly, Xu opened the back door, and several soldiers broke in and killed Gui Lan with one knife. In the name of bereavement, Xu secretly contacted Sun Yi's soldiers to delay the time, which is the revenge of killing his father.