The Battles of Bạch Đằng
The most important lesson to learn from history, is that we do not learn lessons from history.
In the late Tang dynasty, a series of rebellions broke out in what is now Northern Vietnam. Each involved more and more people, until finally they ousted Chinese rule, and formed an autonomous region ruled by the local Khúc clan. In 930 CE, the Southern Han dynasty would invade to recapture the region.