Great Tang: From the Start, I Summon the Great Snow Dragon Riders

In the ninth year of the Wude era, brothers turned against each other at Xuanwu Gate in the capital region, while a massive Turkic army invaded the Central Plains from beyond the frontier. Xu Huaian, dressed in white, stepped forward and summoned the Great Snow Dragon Riders to fight the enemy. His white robes were stained red.

The Turks were defeated, and Xu Huaian withdrew after accomplishing his mission.

Li Shimin: “Whoever finds the young general in white will receive ten thousand in gold!”