 This wall, a combined effort between Yu Zijun and Wang Yue, stretched from present day Hengcheng (橫城) in Lingwu (northwestern Ningxia province) to Huamachi town (花馬池鎮) in Yanchi County, and from there to Qingshuiying (清水營) in northeastern Shaanxi, a total of more than 2000 "li" (about ) long.Along its length were 800 strong points, sentry posts, beacon-fire towers, and assorted defences.40,000 men were enlisted for this effort, which was completed in several months at a cost of over one million silver taels.