Shot Lee at Xuanwu Gate. Why did he cut off his head?

First, ensure that Li 100% dies.

First of all, in the change of Xuanwu Gate, Li Shimin set an ambush in Xuanwu Gate. At that time, only Li and Li Yuanji entered the Xuanwu Gate, and other major forces were waiting outside the Xuanwu Gate. Perhaps Li didn't expect his younger brother to dare to do it directly in the palace, so he was careless at the moment.

As soon as Li and Li Yuanji entered the Xuanwu Gate, they found something was wrong and turned around to run. At this moment, Li Shimin rode out and stopped them. Li originally planned to ignore it and keep his own safety first. However, he didn't expect Li Yuanji to bow and arrow and shoot directly at Li Shimin.

Li Yuanji's hands-on is undoubtedly the contradiction between the two sides that has not yet been put on the table, and it has been completely rolled out. A little scruples Li Shimin completely let go of the hands and feet. Li Yuanji missed him, but his counter-attack hit Lee directly.

At this point, the supporters saw that the two sides had started fighting, and Li was shot off the horse, so he led the army. Because Li was just shot off the horse with an arrow from a distance, in fact, neither anyone else can be sure whether Li is dead at this time, so at my suggestion, I simply beheaded Li and cut off his head to avoid leaving any future trouble.

Second, cut off Li's head and show it to the forces that support Li, completely disintegrating Li's forces.

On the other hand, Li was shot off the horse in Xuanwu Gate. The troops outside saw it and immediately rode to the rescue, making the war between the two sides explosive. The gatekeeper immediately closed the Xuanwu gate, and the troops supporting Li outside could not see Li's situation. They are all worried and want to quickly stabilize the situation and save Li, so the killing on both sides is extremely tragic.

At this time, Li cut off his head inside the door, then occupied the courtyard wall and threw his head out. After everyone saw it, the troops who originally supported Li knew that the tide was gone and had to lay down their weapons, thus stopping the fighting. And if we just inform them that Li is dead without enough evidence, I'm afraid it's hard to convince them that Li is dead, so we cut off Li's head, which is also the fastest and truest way to confirm the authenticity of Li's death.