Passing through Chencang Ancient Road in Liuba County is one of the ancient passages from Guanzhong to Hanzhong. From Yimen in Baoji City, it enters the Qinling Mountains, the western end of Kansai, passes through Li Anyun Temple and Wafangba in Fengxian County, and then passes through Shi Xiang and Mianxian in Liuba Gate, leaving the Qinling Mountains and entering Hanzhong. This road is tortuous and dangerous, with many detours, which was ignored and used by ancient military strategists. However, Han Xin, a general who was good at fighting in the Western Han Dynasty, made extraordinary use of the Chencang ancient road, which surprised him and made him famous in history.
In the first year of Emperor Gaozu (206 BC), Liu Bang was forced to retreat from Hanzhong to Hanwang by overlord Xiang Yu. He adopted the plan of counselor Sean, walked across the plank road and burned it, indicating that he would not go back to Guanzhong to compete with overlord for territory, and he wanted to keep his position in Hanzhong. However, Liu Bang, Han Xin and Sean did not give up their plans to seize Guanzhong. In that year 10, Han Xin ordered Fan Kuai, a general, to build a plank road, and he slackened off slowly, while Han Xin himself and Hanwang Liu Bangze led an army to sneak into Guanzhong by surprise, destroying the three kings designated by the overlord of Sanqin, namely, Sima Xin and Zhai Dongming, which won the home front for the later Chu-Han war and laid a solid foundation for defeating the overlord of Chu.
This old road, this historical relic, has become the source of the idiom "build a plank road in the morning, and spend an hour in the dark." Today, in the north of Li Anyun Temple in Fengxian County, there is a stone tablet with six Chinese characters "Facing Chencang Ancient Road".