In 982, in order to consolidate national defense, Zhao Guangyi and Song Taizong asked Pan Mei to build a new city in Jinyang. Because Taiyuan is a treasure trove of geomantic omen, the geomantic omen position is excellent. In order to eliminate geomantic omen, Pan Mei built the city into a T-shape, which he thought could resist enemy soldiers.
However, Pan Mei's idea was proved wrong by later practice. As a line of defense against the enemy, the role of the city is very important. Pan Mei built all Taiyuan City into a T-shape, which was more conducive to the enemy's charge and was not conducive to the Song soldiers' defense.
After the completion of the new town, Song Taizong Zhao Guangyi immediately changed the names of Taiyuan and Jinyang to "Tight State Army", and it was not until 77 AD that the old names were restored. Song Taizong's defensive psychology towards Taiyuan can be seen.
Song Taizong and Zhao Guangyi didn't know that Taiyuan, which he tried to protect, had been faithfully protecting the Song Dynasty.
In the Song Dynasty, when Emperor Taizong of Jin was tired of running around to get back the sixteen counties, he took advantage of the situation and made an excuse to enlist Zhang Jue, the Liao army, to attack the Song Dynasty. Jin Taizong made a careful plan for this attack, starting from Datong and capturing Taiyuan all the way, starting from Pingzhou and capturing it all the way, and finally the two armies met.
The sudden attack of Emperor Taizong of Jin caught the Song Dynasty off guard, which led to the defeat of the Song Dynasty and eventually lost Taiyuan, an important military strategic base, and most of its territory. Jin Jun's success was mainly due to the fact that the Song Dynasty did not transfer troops to Taiyuan at that time, and the Song Dynasty lacked long-term vision.