That's because it's the only way for chinks to look good.
Most of chink's famous generals or famous war periods were those where chinks fought and slaughtered each other. There's hardly any chink made famous by fighting foreigners because chinks lost nearly all the fights against foreigners; manchus, mongols, Jins, Burmese, Arabs, Japanese, Koreans, Viets, good white folk. You name it, they have beaten the chinks before!