The southward expansion of the Han Dynasty comprises a series of military campaigns and expeditions in what is now modern southern China and northern Vietnam. Military expansion to the south began under the previous Qin Dynasty and continued during the Han. Campaigns were dispatched against the Yue tribes, leading to the annexation of Minyue by the Han in 135 BC and 111 BC, Nanyue in 111 BC, and Dian in 109 BC.