Tsao Siu Yan 曹少钦 (Donnie Yen, 甄�?丹) is a power-crazed eunuch who rules his sector of China as if he were the Emperor and not a mere official. He has built up an elite army of skilled archers and horsemen who receive intensive training and powerful weapons. This ruthless body is known as the Dong Chang (东厂, East Chamber Guards).
a lot of this centers on the definition of 'eunuch'. in some traditions, they lop the whole thing off, but in others, just the pesky sperm receptacles (lore of guilt-free amatory relations between eunuchs and neglected imperial consorts pops up in the reading and most certainly in the cinema).