Chi bi (2008)

In the early third century, the land of Wu is invaded by the warlord Cao Cao and his million soldiers. The ruler of Wu, Sun Quan, calls on the rival warlord Liu Bei for help, but their two armies are still badly outnumbered. However, the Wu strategist Zhou Yu sees that Cao Cao's army is unused to battling on the sea, which may just give them a chance if they can exploit this weakness properly.