Xu Da
The city walls of Dadu were used as the foundation for the Inner city walls of Beijing. In 1368, after Ming troops entered Dadu, General Xu Da directed Hua Jilong to build a second city wall of rammed earth to the south of the original northern city wall. The new wall was later covered with stones and bricks. In 1372 the original northern city wall was completely dismantled and the materials used to reinforce the new wall. The perimeter of the original Imperial city was measured at that time as 1,206 zhang (approximately 4,020 metres). The perimeter of the southern city was 5,328 zhang (approximately 17,760 metres). The southern city consisted of the remnants of the Jin dynasty capital, Zhongdu.