Military history of China before

Post classical East Asia Political: after fall of han, war, invasion, conquest, and foreign rule plagued china end of sixth century centralized imperial rule returns with sui and tang dynasties, as agriculture rises and innovations thrive. Several regional kingdoms but none dominate until Yang Jian and the Sui dynasty, which lasted for less than 30 years. Turkish ruler appointed yang jian to duke of Sui in northern China. In 580 his patron died and left his son in power, but one year later jian forces his abdication and leads a campaign into central asia and south china until the sui dynasty rules china 589-618,central government, walls, military expeditions to central Asia and Korea, high taxes, compulsory labor services, and palaces/granaries