Chen Tai then led his troops across Gaocheng Ridge (高城嶺; northwest of present-day Weiyuan County, Gansu), travelling stealthily day and night, and arrived at the hills southeast of Didao. At the hills, Chen Tai ordered his men to light more fires and beat their war drums loudly to signal to the besieged Wei forces in Didao that reinforcements had arrived. As he expected, the Wei defenders in Didao experienced a surge in their morale, and the Shu forces were taken by surprise. Jiang Wei ordered his troops to retreat. Chen Tai also instructed his men to spread false news that they were planning to cut off the Shu army's retreat route. When Jiang Wei heard about it, he became fearful, so he withdrew his forces on 11 November. The siege on Didao was thus lifted.