Under General Feng Kezhi's orders, Ding Hong actually did take a legitimate action. He was commanded to withdraw all the Dahua Troops near Tengyun to South Wind Pass, and the Troops carried out the order with considerable speed.
The somewhat panicked Dahua Troops were still very swift when executing the retreat order, they followed the commands without hesitation and in doing so, saved themselves.
Amidst the drizzling rain, these Troops abandoned Tengyun and, taking with them the heavy weaponry they could carry, they fled to South Wind Pass in one go.
Soon, the Tang Army occupied Tengyun, capturing it according to plan, and then the armored units began their advance towards South Wind Pass.
The battle broke out near South Wind Pass quickly; a Tang Army Armored Corps battalion attacked along the highway and encountered the Dahua defenders about 10 kilometers away from South Wind Pass.
