The only reason why he and his entourage decide to help the Chinese Imperial Army is because he sets eyes on Mulan.
To top it all off, this man gets the honor of defeating the primary enemy of China, not Mulan.
However, new concerns have arisen in the wake of details about the original spec script for the movie, The Legend of Mulan, which was written by Lauren Hynek and Elizabeth Martin.
Our white savior has come to the aid of Ancient China due to a classic case of Yellow Fever.