One and Only S01E10 - Shi Yi heads alone with the army to reinforce Yong Cheng

Cui Shi Yi leaves the capital and head for the Western Border. They rest in a temple for the night, that night Yang Zhao, the general of Yong Cheng asks Shi Yi to send reinforce Yong Cheng in this battle. Shi Yi leads the army with no hesitation. When Zhou Sheng Chen hers about this he also goes to save Yong Cheng. During the battle, Shi Yi's senior, Xie Yun gets badly hurt and cannot be able to ride a horse again. Zhou Sheng Chen blames this on himself and feels guilty.