Sun Bin was a famous strategist in China during the Spring and Autumn Period and the Warring States Period. He is a disciple of Guiguzi and a native of Qi. In 354 BC, Pang Juan, the general of Wei, sent 80,000 troops and surrounded Handan, the capital of Zhao. Zhao sent messengers to Qi for help. Qi Weiwang wants to make Tian Ji a general and Sun Bin a strategist. Send eighty thousand troops to save Zhao. Tian Ji wanted to go straight to Handan and quickly solve the siege of Zhao. Sun Bin disapproves of this frontal tactic. He suggested to Tian Ji that the elite troops of Wei are now concentrated in Zhao, which is empty inside. If led the troops to tie down the beam of Weidu, occupy its traffic arteries, and attack its empty place, it will inevitably bring down Li Yibao of Zhao, and the Qi army will take advantage of it and meet them in Guiling, a pre-selected combat area. Wei Jun will be defeated and the siege of Zhao will be solved. This strategic thinking will avoid the fatigue of the Qi army's long-distance attack and turn passive into active. Tian Ji readily adopted this suggestion and led the Qi army to kill Wei.

Wei Jun managed to capture Handan, but the news came that the Qi army was besieged and the capital of Wei was in an emergency. Pang Juan busy rate army rescue girder. Go to Guilin and be surrounded by the Qi army. Wei Jun has been fighting hard for a long time, and its foot soldiers are tired. How can he fight the Qi army? The result was defeated and fled, and even the Lord Pang Juan was captured alive. Wei had to make peace with Qi and return to Handan obediently. This is the famous battle of "encircling Wei to save Zhao" in history.