The wall ﹘ which was 25 feet tall, was six to twelve feet wide, and enclosed an area of 12.3 acres ﹘ was completed in March 1847, after four years of construction.
建城寨的工程花了四年時間，在道光廿七年（一八四七年）三月完成，面積十二．三英畝；但清廷一直積弱不振，城寨並未發揮預期功能，令人擔心的事終於來臨。