Anyuan Fort, Artillery battery in Ningbo, China

Anyuan Fort is a circular rammed-earth battery at the foot of Mount Zhaobao in Zhenhai, Ningbo, on the north bank of the Yong River. Its wall is 6 metres high and 2 metres thick, with an inner diameter of 16.5 metres, front and rear gun doors facing the East China Sea and the Yong River, and a circular iron track at the centre for turning the gun. The site covers 328 square metres.

The first Anyuan battery was built by Zhejiang naval commander Ouyang Lijian before the 1885 Battle of Zhenhai in the Sino-French War, armed with three Armstrong muzzle-loading guns. After the war, officials Du Guanying and Wu Jie had a new battery built on the stone outcrop below Mount Zhaobao, facing the Suiyuan battery across the Yong River; it was finished in winter 1888 with one 21 cm Krupp breech-loading gun. In 1936 the government judged the site too far inland, decommissioned it and moved the Krupp gun to the new Zhenyuan battery.

The name Anyuan, "pacify the distance," pairs with the Suiyuan battery across the Yong River, "pacify the far," together guarding the river mouth. The rammed-earth mix of gravel, yellow mud and lime is said to have included glutinous rice to strengthen it. Three replica Qing red-barrelled cannons now stand beside the fort.

The battery stands at the foot of Mount Zhaobao on the south slope of Wulong Ridge, on the north bank of the Yong River. The circular rampart is entered through a surviving 5 m high, 3 m wide doorway; the roof above it is gone, so the interior is open to the sky. The floor is compacted rammed earth, and the central iron track for the gun is set into it.

The circular iron track at the centre of the fort once let the gun crew rotate the 21 cm Krupp breech-loading gun toward either the East China Sea or the Yong River. The rammed-earth walls are said to have been mixed with glutinous rice to strengthen them, and three replicas of Qing red-coated cannon stand beside the battery.