What is the fine-grained topic of the following text: When corrupt Roman leader Tiberius (Adrien Brody) arrives with a giant army to claim the Silk Road, Huo An (Jackie Chan) and his group of trained warriors teams up with an elite legion of defected Roman soldiers led by General Lucius (John Cusack) to maintain the delicate balance of power in the region. Only return the topic.
Roman and Chinese warriors defending the Silk Road from a corrupt Roman leader