Brainwashing!
This was something Fusang did very well. It was especially true during the great war between the Dragon Country and Fusang. Most Fusang soldiers had been brainwashed into believing their actions were not an invasion, but a way of "serving" their country and their home. They believed that entering Dragon Country and occupying it was for mutual prosperity, a way to lead the people of Dragon Country out of poverty.
Back then, the fighting spirit of the people of Dragon Country was ignited, and they were determined to repel Fusang. The Fusangs considered this ignorance. In modern terms, their mentality was: "We're carrying you to victory, and you're attacking us? You're the ones in the wrong!"
