 In 1418, a wealthy farmer, Lê Lợi, led the Lam Sơn uprising against the Ming from his base of Lam Sơn (Thanh Hóa province).Overcoming many early setbacks and with strategic advice from Nguyễn Trãi, Lê Lợi's movement finally gathered momentum, marched northward, and launched a siege at Đông Quan (now Hanoi), the capital of the Ming occupation.The Ming Emperor sent a reinforcement force, but Lê Lợi staged an ambush and killed the Ming commander, Liu Shan, in Chi Lăng.