Deng Ai smuggled about 20,000 soldiers to Yinping.

Deng Ai, whose real name was Deng Fan, with the character Shi Zai, was a native of Yi Yang Shui Yang. He was an outstanding militarist and general of Wei during the Three Kingdoms period. Historically, Deng Ai was a talented man in both military and civil affairs. This man was well versed in the art of war, and he was also quite knowledgeable about the country's internal affairs. Since he became a soldier and a general, Deng Ai spent many years on the western front of Cao Wei guarding against Jiang Wei of Shu Han. In 263, he and Zhong Hui led separate attacks on Shu Han, and in the end, he was the first to enter Chengdu with his troops, which led to the fall of Shu Han. However, his later years were unfortunate, he was slandered and framed by Zhong Hui, and was finally taken into custody by Sima Zhao's suspicion. In the end, he did not escape from the victimization and was killed by Tian, a military general dispatched by Wei Jiao. It was only in the year 273 that he was vindicated and rehabilitated.

In this war of Wei's annihilation of Shu Han, what plays a key role is the joint of Deng Ai's sneaking through Yinping with his troops. We have all heard of the ancient poet Li Bai's "difficult road to Shu", which describes the difficulties and obstacles of the road to Shu, want to cross over more difficult than the sky, as the so-called "difficult road to Shu, difficult to get to the sky". It is such a dangerous place, but Deng Ai boarded it with about 20,000 troops, and succeeded in taking down Chengdu and destroying Shu Han. According to historical records, Shu belongs to the easily defended and difficult to attack territory, Shu had sent 180,000 troops to attack Shu Han in three ways, in which Zhong Hui led the main force of more than 100,000 people, Zhuge Xu and Deng Ai led more than 30,000 soldiers and horses respectively. In the front, the main army led by Zhong Hui was blocked by the Shu army and could not walk forward, at this time Deng Ai came up with the method of sneaking across the border. For them, if the smuggling is successful, it will definitely make part of Shu Han's troops be transferred back, and at this time the main army in front can continue to walk forward.

The idea put forward by Deng Ai was approved by everyone, but the difficulty lies in the fact that the Shu Road is very difficult and hard to travel, the terrain is rugged, and they are in danger of being wiped out at any time. And for this war, sneaking through Yinping on the Shu Road is the best choice and the best breakthrough. For Deng Ai and his men, on the one hand, they could attack Jiang Wei's army from the rear, and once Jiang Wei mobilized his troops in front, they would capture the key place of Jiange; on the other hand, if Jiang Wei didn't mobilize his army, then Deng Ai could lead the army that had been smuggled over to capture the capital city. Only by occupying the capital city, the state of Shu would be equivalent to being opened up, and it would be very easy to attack Shu Han at this time. In this way, Deng Ai took about 20,000 troops to sneak through Yinping, and finally succeeded in sneaking through, and made a great achievement for the destruction of Shu Han.