There's an absolutely silly amount of stuff that adapts from the Three Kingdoms period (Sangoku) and Japan's Warring States era (Sengoku). Considering the amount of characters, action, and drama of the history, it's not hard to see why. Kind of makes me wish we saw such adapting from other histories, for better and for worse. Then again, it seems only in Japan and Asia are accepting of weird and/or crazy interpretations of history.
Oh well, doesn't stop western works that are allegories to wars and such from being made.