Datang: Summon the Snow Dragon Rider at the Beginning

In the ninth year of Wude, the brothers of the Xuanwu Sect inside the pass rebelled against the enemy, and the Turkic army outside the pass invaded the Central Plains. Xu Huaian stood up in white clothes and summoned the Snow Dragon Rider to fight the enemy bravely. His white clothes were dyed into red robes. The Turks were defeated and Xu Huaian retired. Li Shimin: "Whoever finds the young general in white robe will be rewarded with 10,000 gold!"