Red Cliff (2008) on Netflix

In 208 A.D., in the Han Dinasty of China, the tyrannic and greedy Prime Minster Cao Cao forces the reluctant Emperor Han to declare war against the kingdoms of Liu Bei and Sun Quan in the South of China. Cao Cao heads with a mighty army of one million soldiers and attacks Liu Bei. His advisor and war strategist Zhuge Liang heads to South in a diplomatic mission trying to convince Sun Quan to join force with Liu Bei against the powerful warlord. When Zhuge Liang meets the viceroy Zhou Yu, he succeeds in his assignment with the alliance of the two kingdoms against Cao Cao. The armies fight against each other in many battles until the final one in Red Cliff where guile, knowledge and strategy prevail.