雁门关
From 1369 until about 1375, under the early Ming, Dai Prefecture was briefly reorganized as a county. It was during this time that the present fortifications at Yanmen Pass were constructed, and the earthen walls at Shangguan were given a brick façade. Dai Prefecture was administered under the Ming and early Qing as part of the circuits of Yanmen ( or "Yànmén Dào") or Yanping "Yànpíng Dào"), but it was directly administered by the provincial government after 1724 until near the end of the dynasty, when it was returned to Yanping Circuit. During the early 20th century, the Ming wall still surrounded the city, with four gates and a deep moat. Daizhou was the site of a Protestant mission run by the Baptist Missionary Society. The nascent Christian community was, however, devastated in 1900 by the Boxer Rebellion and subsequently by the memory of its powerlessness to defend itself.