Hongwu made an immediate effort to rebuild state infrastructure. He built a long wall around Nanjing, as well as new palaces and government halls. The "History of Ming" states that as early as 1364 Zhu Yuanzhang had begun drafting a new Confucian law code, the "Da Ming Lü", which was completed by 1397 and repeated certain clauses found in the old Tang Code of 653. Hongwu organized a military system known as the "weisuo", which was similar to the "fubing" system of the Tang dynasty (618–907).