The former site of Shajiao Fort refer to those located on Shajiao Mountain on the east coast of Humen seaport. It was built in 1800 and was renamed Liaowang Fort in 1834. The fort was destroyed by the British forces during the First Opium War (1839 to 1842) but repaired after the war. It was however, destroyed again by British forces in 1865. The Qing army carried out repairs and expanded the fort system between 1883 and 1889 building 10 forts, the fort arranged on the mountain and facing the sea forming the complex Shajiao Fort. Here, outside the north gatehouse to the Binhai Fort is the memorial to Lin Zexu and a Krupp cannon. A steel breech loader purchased by the Qing govermnet from Germany's Krupp company. The cannon was made in 1889, with a bore of 240mm (9.448 Inches) and a rifled bore. It weighs 21 tonnes (21 tons) and has an effective range of 10km (6.2 miles) firing up to 2 rounds / min.