Following the ill-fated revolt, Chinese rule became more direct, and the feudal Lac lords faded into history. Ma Yuan established a Chinese-style administrative system of three prefectures and fifty-six districts ruled by scholar-officials sent by the Han court. Although Chinese administrators replaced most former local officials, some members of the Vietnamese aristocracy were allowed to fill lower positions in the bureaucracy. The Vietnamese elite in particular received a thorough indoctrination in Chinese cultural, religious, and political traditions. One result of Sinicization, however, was the creation of a Confucian bureaucratic, family, and social structure that gave the Vietnamese the strength to resist Chinese political domination in later centuries, unlike most of the other Yue peoples who were sooner or later assimilated into the Chinese cultural and political world. Nor was Sinicization so total as to erase the memory of pre-Han Vietnamese culture, especially among the peasant class, which retained the Vietnamese language and many Southeast Asian customs. Chinese rule had the dual effect of making the Vietnamese aristocracy more receptive to Chinese culture and cultural leadership while at the same time instilling resistance and hostility toward Chinese political domination throughout Vietnamese society.
Vietnamese historians regard Trieu Da as a defender of their homeland against an expanding Han empire. In 111 B.C., however, the Chinese armies of Emperor Wu Di defeated the successors of Trieu Da and incorporated Nam Viet into the Han empire. The Chinese were anxious to extend their control over the fertile Red River Delta, in part to serve as a convenient supply point for Han ships engaged in the growing maritime trade with India and Indonesia. During the first century or so of Chinese rule, Vietnam was governed leniently, and the Lac lords maintained their feudal offices. In the first century A.D., however, China intensified its efforts to assimilate its new territories by raising taxes and instituting marriage reforms aimed at turning Vietnam into a patriarchal society more amenable to political authority. In response to increased Chinese domination, a revolt broke out in Giao Chi, Cuu Chan, and Nhat Nam in A.D. 39, led by Trung Trac, the wife of a Lac lord who had been put to death by the Chinese, and her sister Trung Nhi. The insurrection was put down within two years by the Han general Ma Yuan, and the Trung sisters drowned themselves to avoid capture by the Chinese. Still celebrated as heroines by the Vietnamese, the Trung sisters exemplify the relatively high status of women in Vietnamese society as well as the importance to Vietnamese of resistance to foreign rule.